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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