Arrange $N a^{+}, M G^{2 +}, O^{2 -}, F^{-} A l^{3 +}, N^{3 -}$ (each having 10 electrons) in increasing ionic radii.

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

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

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

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None of these

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Solution

The correct option is A $A l^{3 +} < M g^{2 +} < N a^{+} < F^{-} < O^{2 -} < N^{3 -}$
As we know,
$r_{n} \propto \frac{1}{Z}$ (for isoelectronic species)
$A l^{3 +} < M g^{2 +} < N a^{+} < F - < O^{2 -} < N^{3 -}$

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