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Metallic contain a metal and a nonmetal or polyatomic ion, and are generally . The metal is always written first, followed by the nonmetal or polyatomic ion.

For example, the metal sodium and nonmetal chlorine combine to form sodium chloride, $"NaCl"$; the metal calcium and the polyatomic ion carbonate form calcium carbonate, $"CaCO"_3"$; and the metal aluminum and the nonmetal sulfur form aluminum sulfide, $"Al"_2"S"_3"$.

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