Atom - The smallest part of an element, Element - Made of only one type of atom, Mixture - Made of two or more different types of atoms, NOT chemically bonded together, Compound - Made of two or more different types of atoms, chemically bonded together, Proton - A positively charged particle found in the nucleus of an atom, Neutron - An electrically neutral particle found in the nucleus of an atom, Electron - A tiny particle with a negative charge that orbits the nucleus of an atom,

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