The correct order of increasing ionic radii is

N a^{+} < F^{-} < M g^{2 +} < O^{2 -} < N^{3 -}

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N^{3 -} < O^{2 -} < F^{-} < N a^{+} < M g^{2 +}

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F^{-} < N a^{+} < O^{2 -} < M g^{2 +} < N^{3 -}

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M g^{2 +} < N a^{+} < F^{-} < O^{2 -} < N^{3 -}

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Solution

The correct option is D $M g^{2 +} < N a^{+} < F^{-} < O^{2 -} < N^{3 -}$
For isoelectronic species,
Ionic radii $\propto \frac{(-) ve charge}{(+) ve charge}$
Hence, correct order of ionic radii is
$M g^{2 +} < N a^{+} < F^{-} < O^{2 -} < N^{3 -}$

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