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Quinn Science K5
The Periodic Table
| Question | Answer |
|---|---|
| periodic | having a regular, repeating pattern |
| periodic law | states that the chemical and physical properties of elements are periodic functions of their atomic number |
| period | horizontal row of elements on the periodic chart,elments have a regular repeating pattern of properties |
| group | column of elements ot the periodic chart, elements have similiar properties |
| alkali metals | metals, 1 valence electron, most reactive metals, soft, silver, shiny, and low density, group 1 |
| alkaline - earth metals | metals, 2 valence electrons, very reactive but less than gruop 1, silver, more dense than group 1, group 2 |
| halogens | nonmetals, 7 valence electrons, very reactive, poor conductors, react violently with group 1 to form salts, never found uncombined, group 17 |
| noble gases | nonmetals, 8 valence electrons (2 for helium), complete outer shell, unreactive, colorless, oderless, gasses, group 18 |
| metals | most elements, left of zigzag line on periodic table, few electrons in outer energy level, most are solids, malleable, good conductores, ductile, and shiny |
| nonmetals | right of the zigzag ling on the periodic chart, complete or almost complete set of valence electrons, most are gases, dull, poor conductors, not malleable or ductile, |
| metalloids | semiconductors, border the zigzag line on the periodic chart, about half of the valence electrons, have some properites of metals and nonmetals |
| chemical symbol | international committee of scienctists aprove the name and symbol, usually consists of one or two letters, the first is always capitalized rest lower case |
| transition metals | metals, 1 or 2 valence electrons, less reactive than groups one or two, shiny, good conductors, higher density and melting point than groups one or two (except mercury), groups 3 through 12 |
| lanthanides | follow the transition metal lanthanum, shiny, reactive, metals, |
| actinides | follow the transition metal actinium, shiny, reactive, metals, all are radioactive and unstable |
| boron group | one metalloid and four metals, 3 valence electrons, reactive, solids, group 13 |
| carbon group | one nonmetal, two metalloids and two metals, 4 valence electrons, reactivity varies, solids, group 14 |
| nitrogen group | two nonmetals, two metalloids and one metal, 5 valence electrons, reactivity varies, solids except nitrogen, group 15 |
| oxygen group | three nonmetals, one metalloid and one metal, 6 valence electrons, reactive, solids except oxygen, group 16 |
| hydrogen | colorless, oderlass, gas, low density, reacts explosively with oxygen, one valence electron |
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