Which is a valid ionic compound?

A valid ionic compound pairs a metal cation with a nonmetal anion, and its name uses the metal’s element name followed by the nonmetal’s name ending in “-ide.” Sodium is a metal that forms Na⁺, while chlorine forms the chloride ion, Cl⁻. They combine in a 1:1 ratio as sodium chloride (NaCl), so choice C is correct.

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