Elements, Compounds and Mixtures Key Terms

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Atom

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a very small particle that makes up all things (matter)

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Molecule

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two or more atoms joined (bonded) together

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Element

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substance of one type of atom

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Compound

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substance made up of two or more different types of atoms that have been joined (bonded) together

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Mixture

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of substances not chemically bonded

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Periodic Table

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chart of elements by atomic number

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Atomic Number

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of protons in an atom

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Atomic Mass

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mass of an atom's isotopes

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Chemical Bond

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holding atoms together in a molecule

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Covalent Bond

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formed by sharing electrons