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Vocabulary
Chapter 5
| Term | Definition |
|---|---|
| Period | Are the rows of elements in the table of elements |
| Group | Are each column on the periodic table |
| Periodic Law | Pattern of repeating properties |
| Atomic mass unit (amu) | One twelfth the mass of a carbon-12 atom |
| Metals | Good conductors of electric current and heat |
| Transition Metals | Are elements that form a bridge between the elements on the left and right sides of the tabel |
| Nonmetals | Poor conductors of heat and electric current |
| Metalloids | Elements with properties that fall between those of metals and nonmetals |
| Periodic Table | An arrangement of elements in columns, based on a set of properties that repeat from row to row |
| Valence Electron | Electron that is in the highest occupied energy level of an atom |
| Alkali metals | the elements in group 1A |
| Alkaline earth metals | The elements in group 2A |
| Halogens | The elements in group 7A |
| Nobel Gases | The elements in group 8A |