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Ch.5 Vocab

TermDefinition
Period A row in a periodic table of elements the time required for one complete cycle of a periodic motion. a unit of geological time into which geologists divide eras
Group A column of elements in a periodic table
Periodic Law The pattern of repeating properties 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 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 Electrons An electron that is the highest occupied energy level of an atom
Alkali Metals The elements in group 1A of the periodic table, not including hydrogen
Alkaline Earth Metals The elements in group 2A of the periodic table
Halogens The elements in group 7A of the periodic table
Noble Gases The elements in group 8A of the periodic table
Periodic Table An arrangement of elements in columns, based on a set of properties that repeat from row to row
Created by: trevor.hart
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