Which of the following pairs will form the most stable ionic bond?

N a

and

C l

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M g

and

F

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L i

and

F

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N a

and

F

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Solution

The correct option is B $M g$ and $F$
When we talk about the stability of ionic compounds we take into account no.of factors like charge and size of cation, size of an anion.

Since $M g^{2 +}$ has a small size and high charge of all the actions so it's interactions with $F^{-}$ will be strongest.

Hence the most stable out of all ionic compounds.

Hence, the correct option is B.

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F^{-}, N a^{+}, S^{2 -}, C l^{-}

K^{+}

F

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S e

L i

N a

F^{-}, O^{2 -}, N a^{+}, M g^{2 +}

C - H < B r - H < N a - I < F - H < L i - C l < K - F

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