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Chpt 5 vocab

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 in the periodic table
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
Non metals elements that are poor conductors of heat and electric current.
Metalloids elements with properties that fall between those of metals and nonmetals.
Valence electron an electron that is in the highest occupied energy level of an atom.
Alkali metals the elements in group 1A. Have a single valence electron
Alkaline earth metals Elements in group 2A. Have two valence electrons
Halogens elements in group 7A. Have seven valence electrons
Noble gases elements in group 8A. Helium has two valence electrons. Each of the others has eight.
Created by: tonee.edmonds