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Which two pairs of elements would combine to create an ionic compound?

A Sodium and chlorine

Sodium and chlorine are correct because an ionic compound requires metal and a nonmetal. Answer Sodium and argon is incorrect because although argon is a nonmetal, it has a full outer shell and won’t react under normal conditions. Answers Nitrogen and chlorine and Sodium and potassium do not contain both a metal and a nonmetal.