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Sadie

Ch. 5 Vocablulary

TermDefinition
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 table of elements
group each column on the periodic table
periodic law the pattern of repeating properties
atomic mass unit 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 side 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 electrons an electron that is in the highest occupied energy level of an atom
alkali metals have a single valence electron and are extremely reactive
alkaline earth metals have two valence electrons
halogens have seven valence electrons
noble gases have eight valence electrons, except for helium which has two valence elctrons
Created by: sadiewood
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