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chapter 12 vocabulary (the periodic table)
Term | Definition |
---|---|
Periodic | Describes something that occurs or repeats at regular intervals. |
Periodic Law | The law that states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements. |
Period | In chemistry, a horizontal row of elements in the periodic table. |
Group | A vertical column of elements in the periodic table; elements in a group share chemical properties. |
Alkali Metal | One of the elements of Group 1 of the periodic table (lithium, sodium, potassium, rubidium, cesium, and francium.) |
Alkaline-earth Metal | One of the elements of GRoup 2 of the periodic table (beryllium, magnesium, calcium, strontium, barium, and radium.) |
Halogen | One of the elements of Group 17 of the periodic table (fluorine, chlorine, bromine, iodine, and astatine);halogens combine with most metals to form salts. |
Noble Gas | one of the elements of Group 18 of the periodic table (helium, neon,argon, krypton, xenon, and radon); noble gases are unreactive. |