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The correct order of increasing ionic radii is

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${Na}^{+} < F^{-} < {Mg}^{2 +} < O^{2 -} < N^{3 -}$

$F^{-} < {Na}^{+} < O^{2 -} < {Mg}^{2 +} < N^{3 -}$

$N^{3 -} < O^{2 -} < F^{-} < {Na}^{+} < {Mg}^{2 +}$

${Mg}^{2 +} < {Na}^{+} < F^{-} < O^{2 -} < N^{3 -}$

answer is A.

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Detailed Solution

$N^{- 3} > O^{- 2} > F^{-} > {Na}^{+} > {Mg}^{+ 2} (Radii)$
(Isoelectronic species)

In case of Isoelectronic species,

As cationic charge increases, size decreases.
As anionic charge increases, size increases.

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