Which one of the following ions will be smallest in size?

$N a^{+}$

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$M g^{2 +}$

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$F^{-}$

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$O_{2}^{-}$

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Solution

The correct option is B
$M g^{2 +}$

$N a^{+}, M g^{2 +}, O^{2 -}$ and $F^{-}$ all are isoelectronic but $M g^{2 +}$ has 12 protons in his nucleus, so the attraction force on the last shell is maximum and hence, it has the smallest size.

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