atom - the smallest unit of an element that maintains the chemical properties of that element, nucleus - the positively charged central core of an atom, consisting of protons and neutrons, electron - negatively charged particle, neutron - nuetral particle found in nucleus, proton - positiely charged particle found in nucleus, ion - atom with net electric charge, isotope - an atom that has the same number of protons but different number of neutrons, mass number - number of protons and neutrons,

Atomic Structure

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