atom - smallest unit of an element, proton - subatomic structure with a positive charge and has a mass of 1amu, electron - subatomic structure with a negative charge; has virtually no mass, neutron - subatomic particle with a negative charge; has a mass of 1 amu, nucleus - center of the atom, contains protons and neutrons, electron cloud - space outside of the nucleus that electrons flow through, atomic number - found on the periodic table, equal to the number of protons,

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