The charges for four ions are sodium Na plus 1 , calcium Ca plus 2 , fluorine cap f minus 1 , and sulfur cap s minus 2 Which would be an ionic bond that could form from any of these ions?

An ionic compound must have a total charge of zero. Sodium ions have a +1 charge, so two Na⁺ ions balance one S²⁻ ion: 2(+1) + (−2) = 0. Therefore, Na₂S, choice B, is the ionic compound that can form. CaF would not be neutral; calcium needs two fluoride ions, making CaF₂.

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