Atoms - the basic unit of a chemical element , Neutrons - particles found in the nucleus of the atom which have no charge, Nuclecus - the center of an atom that contains protons and neutrons, Proton - positively charged particles found in the nucleus of the atom, Electrons - particles with a negative charge that orbit the nucleus of an atom, Molecules - two or more atoms joined tightly together, Element - a substance that cannot be broken down into a simpler substance,

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