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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