Name, #, Mass, Electronegativity, Density, Valency, Radius, melt/boil, describe

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Hydrogen # 1 --- Mass = 1.01 Electroneg. = 2.1 --- Density = 0.0000833 Valency = 1 --- Radius = 0.12 Melt = 14 - Boil = 20 Colourless, odourless, flammable gas Valence = 1

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Helium # 2 --- Mass = 4 Electroneg. = - --- Density = 0.000166 Valency = 0 --- Radius = 0.18 Melt = 1 - Boil = 4 Colourless, odourless, unreactive gas Valence = 2

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Lithium # 3 --- Mass = 6.94 Electroneg. = 1 --- Density = 0.53 Valency = 1 --- Radius = 0.18 Melt = 454 - Boil = 1615 Shiny, soft, silver-grey, reactive metal Valence = 2, 1

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Beryllium # 4 --- Mass = 9.01 Electroneg. = 1.5 --- Density = 1.85 Valency = 2 --- Radius = - Melt = 1551 - Boil = 3243 Hard, brittle, steel-grey semi-metal Valence = 2, 2

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Boron # 5 --- Mass = 10.81 Electroneg. = 2 --- Density = 2.34 Valency = 3 --- Radius = - Melt = 2573 - Boil = 2823 Hard, brittle, shiny, black semi-metal Valence = 2, 3

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Carbon (graphite) # 6 --- Mass = 12.01 Electroneg. = 2.5 --- Density = 2.25 Valency = 4 (2) --- Radius = 0.17 Melt = 3925 - Boil = 5100 Dark grey solid Valence = 2, 4

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Nitrogen # 7 --- Mass = 14.01 Electroneg. = 3 --- Density = 0.00116 Valency = 3 (5) --- Radius = 0.155 Melt = 63 - Boil = 77 Colourless, odourless, relatively unreactive gas Valence = 2, 5

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Oxygen # 8 --- Mass = 16 Electroneg. = 3.5 --- Density = 0.00133 Valency = 2 --- Radius = 0.15 Melt = 55 - Boil = 90 Colourless, odourless gas, supports combustion Valence = 2, 6

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Fluorine # 9 --- Mass = 19 Electroneg. = 4 --- Density = 0.00158 Valency = 1 --- Radius = 0.155 Melt = 53 - Boil = 85 Pale yellow, highly reactive gas Valence = 2, 7

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Neon # 10 --- Mass = 20.18 Electroneg. = - --- Density = 0.000833 Valency = 0 --- Radius = 0.16 Melt = 25 - Boil = 27 Colourless, odourless, unreactive gas Valence = 2, 8

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Sodium # 11 --- Mass = 22.99 Electroneg. = 0.9 --- Density = 0.97 Valency = 1 --- Radius = 0.23 Melt = 371 - Boil = 1156 Shiny, soft, silver-grey, very reactive metal Valence = 2, 8, 1

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Magnesium # 12 --- Mass = 24.31 Electroneg. = 1.2 --- Density = 1.74 Valency = 2 --- Radius = 0.17 Melt = 922 - Boil = 1380 Shiny, silver-grey, reactive metal Valence = 2, 8, 2

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Aluminium # 13 --- Mass = 26.92 Electroneg. = 1.5 --- Density = 2.7 Valency = 3 --- Radius = - Melt = 933 - Boil = 2740 Shiny, silver-grey metal Valence = 2, 8, 3

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Silicon # 14 --- Mass = 28.09 Electroneg. = 1.8 --- Density = 2.32 Valency = 4 --- Radius = 0.21 Melt = 1683 - Boil = 2628 Shiny grey semi-metal Valence = 2, 8, 4

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Phosphorus (white) # 15 --- Mass = 30.97 Electroneg. = 2.1 --- Density = 1.82 Valency = 5 (3) --- Radius = 0.185 Melt = 317 - Boil = 553 White powder Valence = 2, 8, 5

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Sulfur (rhombic) # 16 --- Mass = 32.06 Electroneg. = 2.5 --- Density = 2.07 Valency = 2 --- Radius = 0.18 Melt = 386 - Boil = 718 Yellow powder Valence = 2, 8, 6

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Chlorine # 17 --- Mass = 35.45 Electroneg. = 3 --- Density = 0.00296 Valency = 1 --- Radius = 0.18 Melt = 172 - Boil = 238 Greenish-yellow, very reactive gas, bleachy smell Valence = 2, 8, 7

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Argon # 18 --- Mass = 39.95 Electroneg. = - --- Density = 0.00166 Valency = 0 --- Radius = 0.19 Melt = 84 - Boil = 87 Colourless, odourless, unreactive gas Valence = 2, 8, 8

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Potassium # 19 --- Mass = 39.1 Electroneg. = 0.8 --- Density = 0.86 Valency = 1 --- Radius = 0.28 Melt = 336 - Boil = 1033 Shiny, soft, silver-grey, extremely reactive metal Valence = 2, 8, 8, 1

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Calcium # 20 --- Mass = 40.08 Electroneg. = 1 --- Density = 1.54 Valency = 2 --- Radius = - Melt = 1112 - Boil = 1757 Shiny, silver-grey, very reactive metal Valence = 2, 8, 8, 2

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Scandium # 21 --- Mass = 44.96 Electroneg. = 1.3 --- Density = 2.99 Valency = 3 --- Radius = - Melt = 1814 - Boil = 3104 Fairly soft, silvery-white metal Valence = 2, 8, 9, 2

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Titanium # 22 --- Mass = 47.9 Electroneg. = 1.5 --- Density = 4.5 Valency = variable --- Radius = - Melt = 1933 - Boil = 3560 Shiny, dark-grey metal Valence = 2, 8, 10, 2

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Vanadium # 23 --- Mass = 50.94 Electroneg. = 1.6 --- Density = 5.96 Valency = variable --- Radius = - Melt = 2163 - Boil = 3653 Silvery-white metal Valence = 2, 8, 11, 2

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Chromium # 24 --- Mass = 52 Electroneg. = 1.6 --- Density = 7.2 Valency = variable --- Radius = - Melt = 2130 - Boil = 2943 Very hard, blue-white metal Valence = 2, 8, 13, 1

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Manganese # 25 --- Mass = 54.94 Electroneg. = 1.5 --- Density = 7.2 Valency = variable --- Radius = - Melt = 1517 - Boil = 2235 Hard, brittle, grey-white metal Valence = 2, 8, 13, 2

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Iron # 26 --- Mass = 55.85 Electroneg. = 1.8 --- Density = 7.86 Valency = 3 (2) --- Radius = - Melt = 1808 - Boil = 3023 Silvery, magnetic metal Valence = 2, 8, 14, 2

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Cobalt # 27 --- Mass = 58.93 Electroneg. = 1.8 --- Density = 8.9 Valency = variable --- Radius = - Melt = 1768 - Boil = 3143 Bluish-grey, magnetic metal Valence = 2, 8, 15, 2

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Nickel # 28 --- Mass = 58.71 Electroneg. = 1.8 --- Density = 8.9 Valency = variable --- Radius = 0.16 Melt = 1728 - Boil = 3003 Hard, silvery-white, magnetic metal Valence = 2, 8, 16, 2

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Copper # 29 --- Mass = 63.55 Electroneg. = 1.9 --- Density = 8.92 Valency = 2 (1) --- Radius = 0.14 Melt = 1356 - Boil = 2840 Reddish-brown, relatively unreactive metal Valence = 2, 8, 18, 1

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Zinc # 30 --- Mass = 65.38 Electroneg. = 1.6 --- Density = 7.14 Valency = 2 --- Radius = 0.14 Melt = 693 - Boil = 1180 Bluish-silver metal Valence = 2, 8, 18, 2

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Gallium # 31 --- Mass = 69.74 Electroneg. = 1.6 --- Density = 5.9 Valency = 3 --- Radius = 0.19 Melt = 303 - Boil = 2676 Soft, blue-white metal Valence = 2, 8, 18, 3

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Germanium # 32 --- Mass = 72.59 Electroneg. = 1.8 --- Density = 5.35 Valency = 4 (2) --- Radius = - Melt = 1210 - Boil = 3103 Greyish-white, brittle semi-metal Valence = 2, 8, 18, 4

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Arsenic (grey) # 33 --- Mass = 74.92 Electroneg. = 2 --- Density = 5.73 Valency = 3 (5) --- Radius = - Melt = 889 - Boil = 889 Steel-grey, brittle semi-metal Valence = 2, 8, 18, 5

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Selenium # 34 --- Mass = 78.96 Electroneg. = 2.4 --- Density = 4.81 Valency = 2 (4) --- Radius = 0.19 Melt = 490 - Boil = 958 Soft grey semi-metal Valence = 2, 8, 18, 6

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Bromine # 35 --- Mass = 79.91 Electroneg. = 2.8 --- Density = 3.12 Valency = 1 --- Radius = 0.19 Melt = 266 - Boil = 332 Reddish-brown reactive liquid, bleachy smell Valence = 2, 8, 18, 7

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Krypton # 36 --- Mass = 83.8 Electroneg. = - --- Density = 0.00346 Valency = 0 --- Radius = 0.2 Melt = 116 - Boil = 121 Colourless, odourless, unreactive gas Valence = 2, 8, 18, 8

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Rubidium # 37 --- Mass = 85.47 Electroneg. = 0.8 --- Density = 1.53 Valency = 1 --- Radius = - Melt = 312 - Boil = 959 Soft, silvery-white, violently reactive metal Valence = 2, 8, 18, 8, 1

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Strontium # 38 --- Mass = 87.62 Electroneg. = 1 --- Density = 2.6 Valency = 2 --- Radius = - Melt = 1042 - Boil = 1657 Soft, silvery, highly reactive metal Valence = 2, 8, 18, 8, 2

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Yttrium # 39 --- Mass = 88.91 Electroneg. = - --- Density = 4.47 Valency = 3 --- Radius = - Melt = 1795 - Boil = 3611 Silvery, fairly reactive metal Valence = 2, 8, 18, 9, 2

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Zirconium # 40 --- Mass = 91.22 Electroneg. = - --- Density = 6.49 Valency = variable --- Radius = - Melt = 2125 - Boil = 4650 Grey-white metal Valence = 2, 8, 18, 10, 2

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Niobium # 41 --- Mass = 92.91 Electroneg. = - --- Density = 8.57 Valency = variable --- Radius = - Melt = 2740 - Boil = 5015 Shiny, white, soft metal Valence = 2, 8, 18, 12, 1

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Molybdenum # 42 --- Mass = 95.94 Electroneg. = 1.8 --- Density = 10.2 Valency = variable --- Radius = - Melt = 2883 - Boil = 5833 Hard, silver-white metal Valence = 2, 8, 18, 13, 1

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Technetium # 43 --- Mass = 98.91 Electroneg. = - --- Density = 11.5 Valency = variable --- Radius = - Melt = 2445 - Boil = 5150 Silver-grey metal Valence = 2, 8, 18, 14, 1

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Ruthenium # 44 --- Mass = 101.07 Electroneg. = - --- Density = 12.3 Valency = variable --- Radius = - Melt = 2583 - Boil = 4173 Brittle, unreactive, silver-grey metal Valence = 2, 8, 18, 15, 1

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Rhodium # 45 --- Mass = 102.91 Electroneg. = - --- Density = 12.4 Valency = variable --- Radius = - Melt = 2239 - Boil = 4000 Hard, silver-white metal Valence = 2, 8, 18, 16, 1

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Palladium # 46 --- Mass = 106.4 Electroneg. = - --- Density = 12.02 Valency = variable --- Radius = - Melt = 1827 - Boil = 3243 Soft, silver-white metal Valence = 2, 8, 18, 18

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Silver # 47 --- Mass = 107.87 Electroneg. = 1.9 --- Density = 10.5 Valency = 1 --- Radius = 0.16 Melt = 1235 - Boil = 2485 Silvery metal Valence = 2, 8, 18, 18, 1

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Cadmium # 48 --- Mass = 112.41 Electroneg. = 1.7 --- Density = 8.64 Valency = 2 --- Radius = 0.17 Melt = 594 - Boil = 1038 Soft, blue-white metal Valence = 2, 8, 18, 18, 2

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Indium # 49 --- Mass = 114.82 Electroneg. = - --- Density = 7.3 Valency = 3 (1) --- Radius = - Melt = 429 - Boil = 2353 Soft, silver-white metal Valence = 2, 8, 18, 18, 3

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Tin (white) # 50 --- Mass = 118.69 Electroneg. = 1.8 --- Density = 7.28 Valency = 4 (2) --- Radius = 0.19 Melt = 505 - Boil = 2543 Soft, silver-white metal Valence = 2, 8, 18, 18, 4

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Antimony # 51 --- Mass = 121.75 Electroneg. = 1.9 --- Density = 6.68 Valency = 3 (5) --- Radius = - Melt = 904 - Boil = 2023 Hard, brittle, silver-white semi-metal Valence = 2, 8, 18, 18, 5

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Tellurium # 52 --- Mass = 127.6 Electroneg. = 2.1 --- Density = 6 Valency = variable --- Radius = 0.21 Melt = 723 - Boil = 1263 Brittle, silver-white, semi-metal Valence = 2, 8, 18, 18, 6

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Iodine # 53 --- Mass = 126.9 Electroneg. = 2.5 --- Density = 4.93 Valency = 1 --- Radius = 0.195 Melt = 387 - Boil = 457 Shiny, black, non-metallic solid with bleachy smell Valence = 2, 8, 18, 18, 7

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Xenon # 54 --- Mass = 131.3 Electroneg. = - --- Density = 0.00546 Valency = 0 --- Radius = 0.22 Melt = 161 - Boil = 166 Colourless, odourless, unreactive gas Valence = 2, 8, 18, 18, 8

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Caesium # 55 --- Mass = 132.91 Electroneg. = 0.7 --- Density = 1.88 Valency = 1 --- Radius = - Melt = 302 - Boil = 942 Soft, shiny, gold-coloured, violently reactive metal Valence = 2, 8, 18, 18, 8, 1

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Barium # 56 --- Mass = 137.33 Electroneg. = 0.9 --- Density = 3.51 Valency = 2 --- Radius = - Melt = 998 - Boil = 1913 Iron-grey, extremely reactive metal Valence = 2, 8, 18, 18, 8, 2

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Lanthanum # 57 --- Mass = 138.91 Electroneg. = - --- Density = 6.14 Valency = 3 --- Radius = - Melt = 1194 - Boil = 3730 Soft, silver-white, reactive metal Valence = 2, 8, 18, 18, 9, 2

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Cerium # 58 --- Mass = 140.12 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Iron-grey, reactive metal Valence = 2, 8, 18, 20, 8, 2

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Praseodymium # 59 --- Mass = 140.91 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Silver-white, fairly soft, reactive metal Valence = 2, 8, 18, 21, 8, 2

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Neodymium # 60 --- Mass = 144.24 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Silver-white, reactive metal Valence = 2, 8, 18, 22, 8, 2

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Promethium # 61 --- Mass = 144.91 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Soft, silvery, fairly reactive metal Valence = 2, 8, 18, 23, 8, 2

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Samarium # 62 --- Mass = 150.35 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Silver-white metal Valence = 2, 8, 18, 24, 8, 2

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Europium # 63 --- Mass = 151.96 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Soft, silvery-white metal Valence = 2, 8, 18, 25, 8, 2

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Gadolinium # 64 --- Mass = 157.25 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Soft, silvery-white metal Valence = 2, 8, 18, 25, 9, 2

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Terbium # 65 --- Mass = 158.93 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Soft, silver-grey metal Valence = 2, 8, 18, 27, 8, 2

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Dysprosium # 66 --- Mass = 162.5 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Soft, silvery metal Valence = 2, 8, 18, 28, 8, 2

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Holmium # 67 --- Mass = 164.93 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Fairly soft, silvery metal Valence = 2, 8, 18, 29, 8, 2

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Erbium # 68 --- Mass = 167.26 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Soft, silver-grey metal Valence = 2, 8, 18, 30, 8, 2

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Thulium # 69 --- Mass = 168.93 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Soft, silvery metal Valence = 2, 8, 18, 31, 8, 2

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Ytterbium # 70 --- Mass = 173.04 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Silver-white metal Valence = 2, 8, 18, 32, 8, 2

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Lutetium # 71 --- Mass = 174.97 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Silver-white, hard, dense metal Valence = 2, 8, 18, 32, 9, 2

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Hafnium # 72 --- Mass = 178.49 Electroneg. = - --- Density = 13.31 Valency = variable --- Radius = - Melt = 2500 - Boil = 4875 Silvery metal Valence = 2, 8, 18, 32, 10, 2

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Tantalum # 73 --- Mass = 180.95 Electroneg. = - --- Density = 16.6 Valency = variable --- Radius = - Melt = 3269 - Boil = 5700 Grey metal Valence = 2, 8, 18, 32, 11, 2

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Tungsten # 74 --- Mass = 183.85 Electroneg. = - --- Density = 19.35 Valency = variable --- Radius = - Melt = 3683 - Boil = 5933 Hard, silver-white metal Valence = 2, 8, 18, 32, 12, 2

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Rhenium # 75 --- Mass = 186.21 Electroneg. = - --- Density = 20.53 Valency = variable --- Radius = - Melt = 3453 - Boil = 5900 Hard, silver-white metal Valence = 2, 8, 18, 32, 13, 2

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Osmium # 76 --- Mass = 190.2 Electroneg. = - --- Density = 22.48 Valency = variable --- Radius = - Melt = 2973 - Boil = 5570 Hard, unreactive, blue-white metal Valence = 2, 8, 18, 32, 14, 2

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Iridium # 77 --- Mass = 192.22 Electroneg. = - --- Density = 22.42 Valency = variable --- Radius = - Melt = 2683 - Boil = 4403 Extremely hard, unreactive, silvery metal Valence = 2, 8, 18, 32, 15, 2

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Platinum # 78 --- Mass = 195.09 Electroneg. = - --- Density = 21.45 Valency = variable --- Radius = - Melt = 2045 - Boil = 4100 Silver-white, unreactive metal Valence = 2, 8, 18, 32, 17, 1

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Gold # 79 --- Mass = 196.97 Electroneg. = 2.4 --- Density = 18.88 Valency = variable --- Radius = 0.175 Melt = 1337 - Boil = 3353 Soft, unreactive, bright yellow metal Valence = 2, 8, 18, 32, 18, 1

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Mercury # 80 --- Mass = 200.59 Electroneg. = 1.9 --- Density = 13.59 Valency = variable --- Radius = 0.17 Melt = 234 - Boil = 630 Dense, silver-white, unreactive liquid metal Valence = 2, 8, 18, 32, 18, 2

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Thallium # 81 --- Mass = 204.37 Electroneg. = - --- Density = 11.85 Valency = 3 (1) --- Radius = - Melt = 577 - Boil = 1730 Soft, grey, fairly reactive metal Valence = 2, 8, 18, 32, 18, 3

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Lead # 82 --- Mass = 207.19 Electroneg. = 1.8 --- Density = 11.34 Valency = 2 (4) --- Radius = 0.2 Melt = 601 - Boil = 2013 Soft, pale-grey, shiny metal Valence = 2, 8, 18, 32, 18, 4

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Bismuth # 83 --- Mass = 208.98 Electroneg. = 1.9 --- Density = 9.8 Valency = 3 (5) --- Radius = 0.2 Melt = 544 - Boil = 1833 Hard, brittle, whitish metal with a reddish tint Valence = 2, 8, 18, 32, 18, 5

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Polonium # 84 --- Mass = 210 Electroneg. = - --- Density = 9.4 Valency = 2 (4) --- Radius = - Melt = 527 - Boil = 1235 Silver-grey metal Valence = 2, 8, 18, 32, 18, 6

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Astatine # 85 --- Mass = 209.99 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = 575 - Boil = 610 Not available in visible quantities Valence = 2, 8, 18, 32, 18, 7

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Radon # 86 --- Mass = 222.02 Electroneg. = - --- Density = 0.00925 Valency = 0 --- Radius = - Melt = 202 - Boil = 211 Colourless, odourless, unreactive gas Valence = 2, 8, 18, 32, 18, 8

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Francium # 87 --- Mass = 223.02 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = 300 - Boil = 950 Not available in visible quantities Valence = 2, 8, 18, 32, 18, 8, 1

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Radium # 88 --- Mass = 226.03 Electroneg. = - --- Density = 5 Valency = 2 --- Radius = - Melt = 973 - Boil = - Silver-white, dense, extremely reactive metal Valence = 2, 8, 18, 32, 18, 8, 2

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Actinium # 89 --- Mass = 227.03 Electroneg. = - --- Density = 10.07 Valency = 3 --- Radius = - Melt = 1323 - Boil = 3473 Soft, silver-white metal Valence = 2, 8, 18, 32, 18, 9, 2

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Thorium # 90 --- Mass = 232.04 Electroneg. = - --- Density = 11.7 Valency = - --- Radius = - Melt = 2023 - Boil = 5060 Soft, silver-white metal Valence = 2, 8, 18, 32, 18, 10, 2

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Protactinium # 91 --- Mass = 231.04 Electroneg. = - --- Density = 15.37 Valency = - --- Radius = - Melt = - - Boil = 4300 Silver-white metal Valence = 2, 8, 18, 32, 20, 9, 2

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Uranium # 92 --- Mass = 238.03 Electroneg. = - --- Density = 19.05 Valency = - --- Radius = - Melt = 1405 - Boil = 4091 Dense, silvery metal Valence = 2, 8, 18, 32, 21, 9, 2

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Neptunium # 93 --- Mass = 239.05 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Silvery metal Valence = 2, 8, 18, 32, 22, 9, 2

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Plutonium # 94 --- Mass = 239.05 Electroneg. = - --- Density = 19.84 Valency = - --- Radius = - Melt = 914 - Boil = 3505 Silver-white metal Valence = 2, 8, 18, 32, 24, 8, 2

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Americium # 95 --- Mass = 243.06 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Silver-white metal Valence = 2, 8, 18, 32, 25, 8, 2

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Curium # 96 --- Mass = 247.07 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Silvery metal Valence = 2, 8, 18, 32, 25, 9, 2

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Berkelium # 97 --- Mass = 247.07 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Silvery metal Valence = 2, 8, 18, 32, 27, 8, 2

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Californium # 98 --- Mass = 252.08 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Silvery metal Valence = 2, 8, 18, 32, 28, 8, 2

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Einsteinium # 99 --- Mass = 254.09 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Silvery metal Valence = 2, 8, 18, 32, 29, 8, 2

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Fermium # 100 --- Mass = 253.09 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Not available in visible quantities Valence = 2, 8, 18, 32, 30, 8, 2

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Mendelevium # 101 --- Mass = 257.1 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Not available in visible quantities Valence = 2, 8, 18, 32, 31, 8, 2

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Nobelium # 102 --- Mass = 255.09 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Not available in visible quantities Valence = 2, 8, 18, 32, 32, 8, 2

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Lawrencium # 103 --- Mass = 257 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Not available in visible quantities Valence = 2, 8, 18, 32, 32, 9, 2

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Rutherfordium # 104 --- Mass = 260 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Not available in visible quantities Valence = 2, 8, 18, 32, 32, 10, 2

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Dubnium # 105 --- Mass = 262.11 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Not available in visible quantities Valence = 2, 8, 18, 32, 32, 11, 2

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Seaborgium # 106 --- Mass = 266.12 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Not available in visible quantities Valence = -

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Bohrium # 107 --- Mass = 264.12 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Not available in visible quantities Valence = -

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Hassium # 108 --- Mass = 269.13 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Not available in visible quantities Valence = -

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Meitnerium # 109 --- Mass = 268.13 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Not available in visible quantities Valence = -

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Hydrogen

H # 1 --- Mass = 1.01 Electroneg. = 2.1 --- Density = 0.0000833 Valency = 1 --- Radius = 0.12 Melt = 14 - Boil = 20 Colourless, odourless, flammable gas Valence = 1

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Helium

He # 2 --- Mass = 4 Electroneg. = - --- Density = 0.000166 Valency = 0 --- Radius = 0.18 Melt = 1 - Boil = 4 Colourless, odourless, unreactive gas Valence = 2

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Lithium

Li # 3 --- Mass = 6.94 Electroneg. = 1 --- Density = 0.53 Valency = 1 --- Radius = 0.18 Melt = 454 - Boil = 1615 Shiny, soft, silver-grey, reactive metal Valence = 2, 1

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Beryllium

Be # 4 --- Mass = 9.01 Electroneg. = 1.5 --- Density = 1.85 Valency = 2 --- Radius = - Melt = 1551 - Boil = 3243 Hard, brittle, steel-grey semi-metal Valence = 2, 2

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Boron

B # 5 --- Mass = 10.81 Electroneg. = 2 --- Density = 2.34 Valency = 3 --- Radius = - Melt = 2573 - Boil = 2823 Hard, brittle, shiny, black semi-metal Valence = 2, 3

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Carbon (graphite)

C # 6 --- Mass = 12.01 Electroneg. = 2.5 --- Density = 2.25 Valency = 4 (2) --- Radius = 0.17 Melt = 3925 - Boil = 5100 Dark grey solid Valence = 2, 4

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Nitrogen

N # 7 --- Mass = 14.01 Electroneg. = 3 --- Density = 0.00116 Valency = 3 (5) --- Radius = 0.155 Melt = 63 - Boil = 77 Colourless, odourless, relatively unreactive gas Valence = 2, 5

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Oxygen

O # 8 --- Mass = 16 Electroneg. = 3.5 --- Density = 0.00133 Valency = 2 --- Radius = 0.15 Melt = 55 - Boil = 90 Colourless, odourless gas, supports combustion Valence = 2, 6

🗑

Fluorine

F # 9 --- Mass = 19 Electroneg. = 4 --- Density = 0.00158 Valency = 1 --- Radius = 0.155 Melt = 53 - Boil = 85 Pale yellow, highly reactive gas Valence = 2, 7

🗑

Neon

Ne # 10 --- Mass = 20.18 Electroneg. = - --- Density = 0.000833 Valency = 0 --- Radius = 0.16 Melt = 25 - Boil = 27 Colourless, odourless, unreactive gas Valence = 2, 8

🗑

Sodium

Na # 11 --- Mass = 22.99 Electroneg. = 0.9 --- Density = 0.97 Valency = 1 --- Radius = 0.23 Melt = 371 - Boil = 1156 Shiny, soft, silver-grey, very reactive metal Valence = 2, 8, 1

🗑

Magnesium

Mg # 12 --- Mass = 24.31 Electroneg. = 1.2 --- Density = 1.74 Valency = 2 --- Radius = 0.17 Melt = 922 - Boil = 1380 Shiny, silver-grey, reactive metal Valence = 2, 8, 2

🗑

Aluminium

Al # 13 --- Mass = 26.92 Electroneg. = 1.5 --- Density = 2.7 Valency = 3 --- Radius = - Melt = 933 - Boil = 2740 Shiny, silver-grey metal Valence = 2, 8, 3

🗑

Silicon

Si # 14 --- Mass = 28.09 Electroneg. = 1.8 --- Density = 2.32 Valency = 4 --- Radius = 0.21 Melt = 1683 - Boil = 2628 Shiny grey semi-metal Valence = 2, 8, 4

🗑

Phosphorus (white)

P # 15 --- Mass = 30.97 Electroneg. = 2.1 --- Density = 1.82 Valency = 5 (3) --- Radius = 0.185 Melt = 317 - Boil = 553 White powder Valence = 2, 8, 5

🗑

Sulfur (rhombic)

S # 16 --- Mass = 32.06 Electroneg. = 2.5 --- Density = 2.07 Valency = 2 --- Radius = 0.18 Melt = 386 - Boil = 718 Yellow powder Valence = 2, 8, 6

🗑

Chlorine

Cl # 17 --- Mass = 35.45 Electroneg. = 3 --- Density = 0.00296 Valency = 1 --- Radius = 0.18 Melt = 172 - Boil = 238 Greenish-yellow, very reactive gas, bleachy smell Valence = 2, 8, 7

🗑

Argon

Ar # 18 --- Mass = 39.95 Electroneg. = - --- Density = 0.00166 Valency = 0 --- Radius = 0.19 Melt = 84 - Boil = 87 Colourless, odourless, unreactive gas Valence = 2, 8, 8

🗑

Potassium

K # 19 --- Mass = 39.1 Electroneg. = 0.8 --- Density = 0.86 Valency = 1 --- Radius = 0.28 Melt = 336 - Boil = 1033 Shiny, soft, silver-grey, extremely reactive metal Valence = 2, 8, 8, 1

🗑

Calcium

Ca # 20 --- Mass = 40.08 Electroneg. = 1 --- Density = 1.54 Valency = 2 --- Radius = - Melt = 1112 - Boil = 1757 Shiny, silver-grey, very reactive metal Valence = 2, 8, 8, 2

🗑

Scandium

Sc # 21 --- Mass = 44.96 Electroneg. = 1.3 --- Density = 2.99 Valency = 3 --- Radius = - Melt = 1814 - Boil = 3104 Fairly soft, silvery-white metal Valence = 2, 8, 9, 2

🗑

Titanium

Ti # 22 --- Mass = 47.9 Electroneg. = 1.5 --- Density = 4.5 Valency = variable --- Radius = - Melt = 1933 - Boil = 3560 Shiny, dark-grey metal Valence = 2, 8, 10, 2

🗑

Vanadium

V # 23 --- Mass = 50.94 Electroneg. = 1.6 --- Density = 5.96 Valency = variable --- Radius = - Melt = 2163 - Boil = 3653 Silvery-white metal Valence = 2, 8, 11, 2

🗑

Chromium

Cr # 24 --- Mass = 52 Electroneg. = 1.6 --- Density = 7.2 Valency = variable --- Radius = - Melt = 2130 - Boil = 2943 Very hard, blue-white metal Valence = 2, 8, 13, 1

🗑

Manganese

Mn # 25 --- Mass = 54.94 Electroneg. = 1.5 --- Density = 7.2 Valency = variable --- Radius = - Melt = 1517 - Boil = 2235 Hard, brittle, grey-white metal Valence = 2, 8, 13, 2

🗑

Iron

Fe # 26 --- Mass = 55.85 Electroneg. = 1.8 --- Density = 7.86 Valency = 3 (2) --- Radius = - Melt = 1808 - Boil = 3023 Silvery, magnetic metal Valence = 2, 8, 14, 2

🗑

Cobalt

Co # 27 --- Mass = 58.93 Electroneg. = 1.8 --- Density = 8.9 Valency = variable --- Radius = - Melt = 1768 - Boil = 3143 Bluish-grey, magnetic metal Valence = 2, 8, 15, 2

🗑

Nickel

Ni # 28 --- Mass = 58.71 Electroneg. = 1.8 --- Density = 8.9 Valency = variable --- Radius = 0.16 Melt = 1728 - Boil = 3003 Hard, silvery-white, magnetic metal Valence = 2, 8, 16, 2

🗑

Copper

Cu # 29 --- Mass = 63.55 Electroneg. = 1.9 --- Density = 8.92 Valency = 2 (1) --- Radius = 0.14 Melt = 1356 - Boil = 2840 Reddish-brown, relatively unreactive metal Valence = 2, 8, 18, 1

🗑

Zinc

Zn # 30 --- Mass = 65.38 Electroneg. = 1.6 --- Density = 7.14 Valency = 2 --- Radius = 0.14 Melt = 693 - Boil = 1180 Bluish-silver metal Valence = 2, 8, 18, 2

🗑

Gallium

Ga # 31 --- Mass = 69.74 Electroneg. = 1.6 --- Density = 5.9 Valency = 3 --- Radius = 0.19 Melt = 303 - Boil = 2676 Soft, blue-white metal Valence = 2, 8, 18, 3

🗑

Germanium

Ge # 32 --- Mass = 72.59 Electroneg. = 1.8 --- Density = 5.35 Valency = 4 (2) --- Radius = - Melt = 1210 - Boil = 3103 Greyish-white, brittle semi-metal Valence = 2, 8, 18, 4

🗑

Arsenic (grey)

As # 33 --- Mass = 74.92 Electroneg. = 2 --- Density = 5.73 Valency = 3 (5) --- Radius = - Melt = 889 - Boil = 889 Steel-grey, brittle semi-metal Valence = 2, 8, 18, 5

🗑

Selenium

Se # 34 --- Mass = 78.96 Electroneg. = 2.4 --- Density = 4.81 Valency = 2 (4) --- Radius = 0.19 Melt = 490 - Boil = 958 Soft grey semi-metal Valence = 2, 8, 18, 6

🗑

Bromine

Br # 35 --- Mass = 79.91 Electroneg. = 2.8 --- Density = 3.12 Valency = 1 --- Radius = 0.19 Melt = 266 - Boil = 332 Reddish-brown reactive liquid, bleachy smell Valence = 2, 8, 18, 7

🗑

Krypton

Kr # 36 --- Mass = 83.8 Electroneg. = - --- Density = 0.00346 Valency = 0 --- Radius = 0.2 Melt = 116 - Boil = 121 Colourless, odourless, unreactive gas Valence = 2, 8, 18, 8

🗑

Rubidium

Rb # 37 --- Mass = 85.47 Electroneg. = 0.8 --- Density = 1.53 Valency = 1 --- Radius = - Melt = 312 - Boil = 959 Soft, silvery-white, violently reactive metal Valence = 2, 8, 18, 8, 1

🗑

Strontium

Sr # 38 --- Mass = 87.62 Electroneg. = 1 --- Density = 2.6 Valency = 2 --- Radius = - Melt = 1042 - Boil = 1657 Soft, silvery, highly reactive metal Valence = 2, 8, 18, 8, 2

🗑

Yttrium

Y # 39 --- Mass = 88.91 Electroneg. = - --- Density = 4.47 Valency = 3 --- Radius = - Melt = 1795 - Boil = 3611 Silvery, fairly reactive metal Valence = 2, 8, 18, 9, 2

🗑

Zirconium

Zr # 40 --- Mass = 91.22 Electroneg. = - --- Density = 6.49 Valency = variable --- Radius = - Melt = 2125 - Boil = 4650 Grey-white metal Valence = 2, 8, 18, 10, 2

🗑

Niobium

Nb # 41 --- Mass = 92.91 Electroneg. = - --- Density = 8.57 Valency = variable --- Radius = - Melt = 2740 - Boil = 5015 Shiny, white, soft metal Valence = 2, 8, 18, 12, 1

🗑

Molybdenum

Mo # 42 --- Mass = 95.94 Electroneg. = 1.8 --- Density = 10.2 Valency = variable --- Radius = - Melt = 2883 - Boil = 5833 Hard, silver-white metal Valence = 2, 8, 18, 13, 1

🗑

Technetium

Tc # 43 --- Mass = 98.91 Electroneg. = - --- Density = 11.5 Valency = variable --- Radius = - Melt = 2445 - Boil = 5150 Silver-grey metal Valence = 2, 8, 18, 14, 1

🗑

Ruthenium

Ru # 44 --- Mass = 101.07 Electroneg. = - --- Density = 12.3 Valency = variable --- Radius = - Melt = 2583 - Boil = 4173 Brittle, unreactive, silver-grey metal Valence = 2, 8, 18, 15, 1

🗑

Rhodium

Rh # 45 --- Mass = 102.91 Electroneg. = - --- Density = 12.4 Valency = variable --- Radius = - Melt = 2239 - Boil = 4000 Hard, silver-white metal Valence = 2, 8, 18, 16, 1

🗑

Palladium

Pd # 46 --- Mass = 106.4 Electroneg. = - --- Density = 12.02 Valency = variable --- Radius = - Melt = 1827 - Boil = 3243 Soft, silver-white metal Valence = 2, 8, 18, 18

🗑

Silver

Ag # 47 --- Mass = 107.87 Electroneg. = 1.9 --- Density = 10.5 Valency = 1 --- Radius = 0.16 Melt = 1235 - Boil = 2485 Silvery metal Valence = 2, 8, 18, 18, 1

🗑

Cadmium

Cd # 48 --- Mass = 112.41 Electroneg. = 1.7 --- Density = 8.64 Valency = 2 --- Radius = 0.17 Melt = 594 - Boil = 1038 Soft, blue-white metal Valence = 2, 8, 18, 18, 2

🗑

Indium

In # 49 --- Mass = 114.82 Electroneg. = - --- Density = 7.3 Valency = 3 (1) --- Radius = - Melt = 429 - Boil = 2353 Soft, silver-white metal Valence = 2, 8, 18, 18, 3

🗑

Tin (white)

Sn # 50 --- Mass = 118.69 Electroneg. = 1.8 --- Density = 7.28 Valency = 4 (2) --- Radius = 0.19 Melt = 505 - Boil = 2543 Soft, silver-white metal Valence = 2, 8, 18, 18, 4

🗑

Antimony

Sb # 51 --- Mass = 121.75 Electroneg. = 1.9 --- Density = 6.68 Valency = 3 (5) --- Radius = - Melt = 904 - Boil = 2023 Hard, brittle, silver-white semi-metal Valence = 2, 8, 18, 18, 5

🗑

Tellurium

Te # 52 --- Mass = 127.6 Electroneg. = 2.1 --- Density = 6 Valency = variable --- Radius = 0.21 Melt = 723 - Boil = 1263 Brittle, silver-white, semi-metal Valence = 2, 8, 18, 18, 6

🗑

Iodine

I # 53 --- Mass = 126.9 Electroneg. = 2.5 --- Density = 4.93 Valency = 1 --- Radius = 0.195 Melt = 387 - Boil = 457 Shiny, black, non-metallic solid with bleachy smell Valence = 2, 8, 18, 18, 7

🗑

Xenon

Xe # 54 --- Mass = 131.3 Electroneg. = - --- Density = 0.00546 Valency = 0 --- Radius = 0.22 Melt = 161 - Boil = 166 Colourless, odourless, unreactive gas Valence = 2, 8, 18, 18, 8

🗑

Caesium

Cs # 55 --- Mass = 132.91 Electroneg. = 0.7 --- Density = 1.88 Valency = 1 --- Radius = - Melt = 302 - Boil = 942 Soft, shiny, gold-coloured, violently reactive metal Valence = 2, 8, 18, 18, 8, 1

🗑

Barium

Ba # 56 --- Mass = 137.33 Electroneg. = 0.9 --- Density = 3.51 Valency = 2 --- Radius = - Melt = 998 - Boil = 1913 Iron-grey, extremely reactive metal Valence = 2, 8, 18, 18, 8, 2

🗑

Lanthanum

La # 57 --- Mass = 138.91 Electroneg. = - --- Density = 6.14 Valency = 3 --- Radius = - Melt = 1194 - Boil = 3730 Soft, silver-white, reactive metal Valence = 2, 8, 18, 18, 9, 2

🗑

Cerium

Ce # 58 --- Mass = 140.12 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Iron-grey, reactive metal Valence = 2, 8, 18, 20, 8, 2

🗑

Praseodymium

Pr # 59 --- Mass = 140.91 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Silver-white, fairly soft, reactive metal Valence = 2, 8, 18, 21, 8, 2

🗑

Neodymium

Nd # 60 --- Mass = 144.24 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Silver-white, reactive metal Valence = 2, 8, 18, 22, 8, 2

🗑

Promethium

Pm # 61 --- Mass = 144.91 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Soft, silvery, fairly reactive metal Valence = 2, 8, 18, 23, 8, 2

🗑

Samarium

Sm # 62 --- Mass = 150.35 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Silver-white metal Valence = 2, 8, 18, 24, 8, 2

🗑

Europium

Eu # 63 --- Mass = 151.96 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Soft, silvery-white metal Valence = 2, 8, 18, 25, 8, 2

🗑

Gadolinium

Gd # 64 --- Mass = 157.25 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Soft, silvery-white metal Valence = 2, 8, 18, 25, 9, 2

🗑

Terbium

Tb # 65 --- Mass = 158.93 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Soft, silver-grey metal Valence = 2, 8, 18, 27, 8, 2

🗑

Dysprosium

Dy # 66 --- Mass = 162.5 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Soft, silvery metal Valence = 2, 8, 18, 28, 8, 2

🗑

Holmium

Ho # 67 --- Mass = 164.93 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Fairly soft, silvery metal Valence = 2, 8, 18, 29, 8, 2

🗑

Erbium

Er # 68 --- Mass = 167.26 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Soft, silver-grey metal Valence = 2, 8, 18, 30, 8, 2

🗑

Thulium

Tm # 69 --- Mass = 168.93 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Soft, silvery metal Valence = 2, 8, 18, 31, 8, 2

🗑

Ytterbium

Yb # 70 --- Mass = 173.04 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Silver-white metal Valence = 2, 8, 18, 32, 8, 2

🗑

Lutetium

Lu # 71 --- Mass = 174.97 Electroneg. = - --- Density = - Valency = 3 --- Radius = - Melt = - - Boil = - Silver-white, hard, dense metal Valence = 2, 8, 18, 32, 9, 2

🗑

Hafnium

Hf # 72 --- Mass = 178.49 Electroneg. = - --- Density = 13.31 Valency = variable --- Radius = - Melt = 2500 - Boil = 4875 Silvery metal Valence = 2, 8, 18, 32, 10, 2

🗑

Tantalum

Ta # 73 --- Mass = 180.95 Electroneg. = - --- Density = 16.6 Valency = variable --- Radius = - Melt = 3269 - Boil = 5700 Grey metal Valence = 2, 8, 18, 32, 11, 2

🗑

Tungsten

W # 74 --- Mass = 183.85 Electroneg. = - --- Density = 19.35 Valency = variable --- Radius = - Melt = 3683 - Boil = 5933 Hard, silver-white metal Valence = 2, 8, 18, 32, 12, 2

🗑

Rhenium

Re # 75 --- Mass = 186.21 Electroneg. = - --- Density = 20.53 Valency = variable --- Radius = - Melt = 3453 - Boil = 5900 Hard, silver-white metal Valence = 2, 8, 18, 32, 13, 2

🗑

Osmium

Os # 76 --- Mass = 190.2 Electroneg. = - --- Density = 22.48 Valency = variable --- Radius = - Melt = 2973 - Boil = 5570 Hard, unreactive, blue-white metal Valence = 2, 8, 18, 32, 14, 2

🗑

Iridium

Ir # 77 --- Mass = 192.22 Electroneg. = - --- Density = 22.42 Valency = variable --- Radius = - Melt = 2683 - Boil = 4403 Extremely hard, unreactive, silvery metal Valence = 2, 8, 18, 32, 15, 2

🗑

Platinum

Pt # 78 --- Mass = 195.09 Electroneg. = - --- Density = 21.45 Valency = variable --- Radius = - Melt = 2045 - Boil = 4100 Silver-white, unreactive metal Valence = 2, 8, 18, 32, 17, 1

🗑

Gold

Au # 79 --- Mass = 196.97 Electroneg. = 2.4 --- Density = 18.88 Valency = variable --- Radius = 0.175 Melt = 1337 - Boil = 3353 Soft, unreactive, bright yellow metal Valence = 2, 8, 18, 32, 18, 1

🗑

Mercury

Hg # 80 --- Mass = 200.59 Electroneg. = 1.9 --- Density = 13.59 Valency = variable --- Radius = 0.17 Melt = 234 - Boil = 630 Dense, silver-white, unreactive liquid metal Valence = 2, 8, 18, 32, 18, 2

🗑

Thallium

Tl # 81 --- Mass = 204.37 Electroneg. = - --- Density = 11.85 Valency = 3 (1) --- Radius = - Melt = 577 - Boil = 1730 Soft, grey, fairly reactive metal Valence = 2, 8, 18, 32, 18, 3

🗑

Lead

Pb # 82 --- Mass = 207.19 Electroneg. = 1.8 --- Density = 11.34 Valency = 2 (4) --- Radius = 0.2 Melt = 601 - Boil = 2013 Soft, pale-grey, shiny metal Valence = 2, 8, 18, 32, 18, 4

🗑

Bismuth

Bi # 83 --- Mass = 208.98 Electroneg. = 1.9 --- Density = 9.8 Valency = 3 (5) --- Radius = 0.2 Melt = 544 - Boil = 1833 Hard, brittle, whitish metal with a reddish tint Valence = 2, 8, 18, 32, 18, 5

🗑

Polonium

Po # 84 --- Mass = 210 Electroneg. = - --- Density = 9.4 Valency = 2 (4) --- Radius = - Melt = 527 - Boil = 1235 Silver-grey metal Valence = 2, 8, 18, 32, 18, 6

🗑

Astatine

At # 85 --- Mass = 209.99 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = 575 - Boil = 610 Not available in visible quantities Valence = 2, 8, 18, 32, 18, 7

🗑

Radon

Rn # 86 --- Mass = 222.02 Electroneg. = - --- Density = 0.00925 Valency = 0 --- Radius = - Melt = 202 - Boil = 211 Colourless, odourless, unreactive gas Valence = 2, 8, 18, 32, 18, 8

🗑

Francium

Fr # 87 --- Mass = 223.02 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = 300 - Boil = 950 Not available in visible quantities Valence = 2, 8, 18, 32, 18, 8, 1

🗑

Radium

Ra # 88 --- Mass = 226.03 Electroneg. = - --- Density = 5 Valency = 2 --- Radius = - Melt = 973 - Boil = - Silver-white, dense, extremely reactive metal Valence = 2, 8, 18, 32, 18, 8, 2

🗑

Actinium

Ac # 89 --- Mass = 227.03 Electroneg. = - --- Density = 10.07 Valency = 3 --- Radius = - Melt = 1323 - Boil = 3473 Soft, silver-white metal Valence = 2, 8, 18, 32, 18, 9, 2

🗑

Thorium

Th # 90 --- Mass = 232.04 Electroneg. = - --- Density = 11.7 Valency = - --- Radius = - Melt = 2023 - Boil = 5060 Soft, silver-white metal Valence = 2, 8, 18, 32, 18, 10, 2

🗑

Protactinium

Pa # 91 --- Mass = 231.04 Electroneg. = - --- Density = 15.37 Valency = - --- Radius = - Melt = - - Boil = 4300 Silver-white metal Valence = 2, 8, 18, 32, 20, 9, 2

🗑

Uranium

U # 92 --- Mass = 238.03 Electroneg. = - --- Density = 19.05 Valency = - --- Radius = - Melt = 1405 - Boil = 4091 Dense, silvery metal Valence = 2, 8, 18, 32, 21, 9, 2

🗑

Neptunium

Np # 93 --- Mass = 239.05 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Silvery metal Valence = 2, 8, 18, 32, 22, 9, 2

🗑

Plutonium

Pu # 94 --- Mass = 239.05 Electroneg. = - --- Density = 19.84 Valency = - --- Radius = - Melt = 914 - Boil = 3505 Silver-white metal Valence = 2, 8, 18, 32, 24, 8, 2

🗑

Americium

Am # 95 --- Mass = 243.06 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Silver-white metal Valence = 2, 8, 18, 32, 25, 8, 2

🗑

Curium

Cm # 96 --- Mass = 247.07 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Silvery metal Valence = 2, 8, 18, 32, 25, 9, 2

🗑

Berkelium

Bk # 97 --- Mass = 247.07 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Silvery metal Valence = 2, 8, 18, 32, 27, 8, 2

🗑

Californium

Cf # 98 --- Mass = 252.08 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Silvery metal Valence = 2, 8, 18, 32, 28, 8, 2

🗑

Einsteinium

Es # 99 --- Mass = 254.09 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Silvery metal Valence = 2, 8, 18, 32, 29, 8, 2

🗑

Fermium

Fm # 100 --- Mass = 253.09 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Not available in visible quantities Valence = 2, 8, 18, 32, 30, 8, 2

🗑

Mendelevium

Md # 101 --- Mass = 257.1 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Not available in visible quantities Valence = 2, 8, 18, 32, 31, 8, 2

🗑

Nobelium

No # 102 --- Mass = 255.09 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Not available in visible quantities Valence = 2, 8, 18, 32, 32, 8, 2

🗑

Lawrencium

Lr # 103 --- Mass = 257 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Not available in visible quantities Valence = 2, 8, 18, 32, 32, 9, 2

🗑

Rutherfordium

Rf # 104 --- Mass = 260 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Not available in visible quantities Valence = 2, 8, 18, 32, 32, 10, 2

🗑

Dubnium

Db # 105 --- Mass = 262.11 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Not available in visible quantities Valence = 2, 8, 18, 32, 32, 11, 2

🗑

Seaborgium

Sg # 106 --- Mass = 266.12 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Not available in visible quantities Valence = -

🗑

Bohrium

Bh # 107 --- Mass = 264.12 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Not available in visible quantities Valence = -

🗑

Hassium

Hs # 108 --- Mass = 269.13 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Not available in visible quantities Valence = -

🗑

Meitnerium

Mt # 109 --- Mass = 268.13 Electroneg. = - --- Density = - Valency = - --- Radius = - Melt = - - Boil = - Not available in visible quantities Valence = -

🗑

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