Protons - Subatomic particle that is positively charged, Neutrons - Subatomic particles that have no charge, Electrons - Negatively charged particle found in all atoms, Pure Substance - Substances that are made up of only one particle and have a fixed structure, Compound - A substance made of two or more different elements, Atom - A particle that consists of a nucleus of protons and neutrons surrounded by a cloud of electrons, Element - A chemical substance that cannot be broken into smaller pieces, Nucleus - Electrons, protons and neutrons form a ,

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