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Chapter 5 Vocab
| Term | Definition |
|---|---|
| periodic table | an arrangement of elements in columns, based on a set of properties that repeat from row to row |
| period | each row in the periodic table of elements |
| group | each column on the periodic table of elements |
| periodic law | the pattern of repeating properties displayed by elements in the periodic table |
| atomic mass unit | one twelfth the mass on a carbon 12 atom |
| metals | elements that are good conductors of electric current and heat |
| transition metals | elements that form a bridge between elements on the left and right sides of the periodic table |
| nonmetals | elements that are poor conductors of electric current and heat |
| metalloids | elements with properties that fall between those of metals and nonmetals |
| valence electronens | an electron that is in the highest occupied energy level |
| alkali metals | metals that have a single valence electron and are extremely reactive |
| alkaline earth metals | metals that have 2 valence electrons |
| halogens | elements in group 7A |
| noble gases | elements in group 8A |