Atom - The smallest part of any element, Molecule - More than one atom chemically joined together, Nucleus - The center of an atom, Proton - A positive particle found in the nucleus, Neutron - An uncharged particle found in the nucleus, Electron - A negative particle found in shells outside of the nucleus, Atomic number - Tells us the number of protons (and electrons), Mass number - The number of protons and neutrons added together,

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