Matter, anything that take up space and has mass, Nucleus, the center of the atom, which contains protons and neutons, Proton, subatomic particle with a positive charge found in the nucleus, Neutron, particles with no charge are found in the nucleus, Electron, subatomic particles with negative charges that orbit the nucleus, atom, the smallest particle of a substance, atomic mass, approximate mass of an atom, atomic number, unique number of protons

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