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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