atom - the smallest unit of matter; building block of molecules, subatomic particles (subunits) - smaller units that make up an atom, proton - subatomic unit that has a positive (+) charge and is located in the nucleus of an atom, electron - subatomic unit that has a negative (-) charge and is located in orbit around the nucleus of an atom, neutron - subatomic unit that has no charge (0) and is located in the nucleus of an atom, nucleus - the center of an atom, containing the protons (+) and neutrons (0), subatomic unit a - electron, subatomic unit b - neutron, subatomic unit c - proton,

Atomic Structure Notebook Notes

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