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lauren staats
chapter 5 vocabulary
| Term | Definition |
|---|---|
| periodic table | an arrangement of elements in columns,based on a set of properties that repeat from row to row. |
| period | a row in a periodic table of elements the time required for one complete cycle of a periodic motion. |
| group | a column of elements in a periodic table. |
| periodic law | the pattern of repeating displayed by elements in the periodic table. |
| atomic mass unit | one twelfth the mass of a carbon-12 atom. |
| metals | elements that are good conductors of heat and electric current. |
| transition metals | elements that form a bridge between elements on the left and the right sides of the periodic table. |
| nonmetals | elements that are poor conductors of heat and electric current |
| metalloids | elements with properties that fall between those metals and nonmetals |
| valence electrons | an electron that is in the highest occupied energy level of an atom |
| alkali metals | elements in Group 1A |
| alkaline earth metals | elements in Group 2A |
| halogens | elements in Group 7A |
| noble gases | elements in Group 8A |