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Marina Dopudj
Chapter 5 Vocabulary
| Term | Definition |
|---|---|
| period | row in periodic table of elements |
| group | column of elements in a periodic table |
| periodic law | pattern of repeating properties displayed by elements in the periodic table |
| atomic mass unit (amu) | 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 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 of metals and nonmetals |
| valence electron | electron that is the highest occupied energy level of an atom |
| alkali metals | elements in Group 1A of the periodic table, not including hydrogen |
| alkaline earth metals | elements in Group 2A of the periodic table |
| halogens | elements in Group 7A of the periodic table |
| noble gases | elements in Group 8A of the periodic table |
| periodic table | arrangement of elements in columns, based on a set of properties that repeat from row to row |