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$O^{2 -}$ , $F^{F -}$ , $N a^{+}$ and $M g^{2 +}$ are isoelectronic, the order of increasing size is

A. $F^{-} < N a^{+} g^{+ +} < O^{2 -}$

B. $F^{-} < O^{2 -} < N a^{+} < M g^{+ +}$

C. $M g^{+ +} < F^{-} < N a^{+} < O^{2 -}$

D. $M g^{+ +} < N a^{+} < F^{-} < O^{2 -}$

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Correct Answer :

D. $M g^{+ +} < N a^{+} < F^{-} < O^{2 -}$

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