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vocabulary 5
Term | Definition |
---|---|
periodic table | arrangement of elements in compounds, based on a set of properties that repeat from row to row |
period | each row in the table of elements |
group | each column on the periodic table |
periodic law | the pattern of repeating properties |
atomic mass unit | defined as one twelfth the mass of a carbon-12 atom |
metals | elements that are good conductors of electric current and heat |
transition metals | elements that form a bridge between the elements on the left and right sides of the 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 in the highest occupied energy level in an atom |
alkali metals | the elements in group 1A |
alkaline earth metals | the elements in group 2A |
halogens | the elements in group 7A |
noble gases | the elements in group 8A |