noble gases - do not react with other elements, metalloids - have qualities of both metals and nonmetals, nonmetals - brittle, dull, poor conductors of heat and electricity, metals - high density, high melting point, good conductors of heat and electricity, atomic number - the number of protons in an atom, atomic mass - the number of protons AND neutrons in an atom, proton - positive charged particle in the nucleus of an atom, neutron - particle with no charge, in the nucleus of an atom, electron - negatively charged particle outside the nucleus of an atom, atoms - what all living things are made of, periods - the rows of the Periodic Table, groups families - the columns of the Periodic Table,

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