Which of the following pairs of elements is most likely to form an ionic bond?
Magnesium and chlorine
An ionic bond forms when a metal gives electrons to a non-metal.
Magnesium is a metal that loses two electrons and chlorine is a non-metal that gains one, forming MgCl2 (Mg2+ and Cl− ions).
Nitrogen-oxygen and hydrogen-carbon form covalent bonds, and copper and iron are both metals.
Hence, the answer is magnesium and chlorine.
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