Element - A substance made up of only atoms with the same number of protons, Molecule - Two or more atoms of one or more elements chemically joined. , Compound - Two or more atoms of two or more elements chemically joined, Mixture - A substance made of two or more elements or compounds not chemically joined, Isotope - Atoms with the same number of protons and electrons but a different number of neutrons in the nucleus, Word equation - A way of representing a chemical reaction using the names of the chemicals used. , Chemical equation - A way of representing a chemical reaction using the chemical formulae and state symbols of the chemicals used., Solvent - A liquid that can dissolve another substance, Solute - A substance dissolved in a solvent, Solution - A mixture made up of a solvent and a solute. ,

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