Which of the following ions is smallest in size?

{C l}^{-}

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{N a}^{+}

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{M g}^{2 +}

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S^{2 -}

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Solution

The correct option is C ${M g}^{2 +}$
The ionic size is the smallest for the $M g^{2 +}$ .

$N a^{+}$ and $M g^{2 +}$ contains 2 shells of electrons whereas $C l^{-}$ and $S^{2 -}$ contain 3 shells of electrons. Hence the ionic radii of $N a^{+}$ and $M g^{2 +}$ are smaller than the ionic radii of $C l^{-}$ and $S^{2 -}$ . $M g^{2 +}$ and $N a^{+}$ are isoelectronic species. The effective nuclear charge of the $M g^{2 +}$ is higher than the effective nuclear charge of $N a^{+}$ . Hence, the ionic radius of $M g^{2 +}$ is the smallest.

The correct option is C.

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N a^{+}

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Question 20

In which of the following pairs, the ions are isoelectronic ?

(a) $N a^{+}, M g^{2 +}$ (b) $A l^{3 +}, O^{-}$ (c) $N a^{+}, O^{2 -}$ (d) $N^{3 -}, C l^{-}$

N a^{+}, M g^{2 +}, A l^{3 +}

S i^{4 +}

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