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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 |