When sodium atoms Na and chlorine atoms Cl join to make sodium chloride, or table salt, they form an ionic bond. Using this information, which pair of elements is most likely to form an ionic bond?

Ionic bonds most commonly form between a metal and a nonmetal, when electrons transfer from one atom to the other. Potassium is a metal and fluorine is a nonmetal, so they are likely to form an ionic bond. Calcium and neon is unlikely because neon is an unreactive noble gas; the other pairs are both metals or both nonmetals.

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