Which combination will give the strongest ionic bond ?

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${Na}^{+} and {Cl}^{-}$

${Mg}^{2 +} and O^{2 -}$

${Mg}^{2 +} and {Cl}^{-}$

${Na}^{+} and O^{2 -}$

answer is D.

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Detailed Solution

Ionic bond strength depends on two factors :

a) Ionic charge - the greater the product of the ionic charges. the stronger the bond.

b) Ionic size - the lower the sum of the anion and cation radii, the stronger the bond.

Mg⁺² and O^-2 ions have smaller sizes and more charges compared to the rest. They will form a stronger ionic bond.

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