The ions below are listed in order of increasing radii except:

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$\begin{aligned} {Al}^{3 +} < {Mg}^{2 +} < {Na}^{+} \end{aligned}$

$\begin{aligned} O^{2 -} < F^{-} < {Na}^{+} \end{aligned}$

$\begin{aligned} K^{+} < {Cl}^{-} < {Se}^{2 -} \end{aligned}$

$\begin{aligned} {Cl}^{-} < {Br}^{-} < I^{-} \end{aligned}$

answer is D.

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Detailed Solution

Since atomic radius grows when we walk down a group and reduces as we move from left to right in a period. The ions below are listed in order of increasing radii $\begin{aligned} O^{2 -} < F^{-} < {Na}^{+} \end{aligned}$ .

Hence, the option D is correct.

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