The ion with largest radius is

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$O^{- 2}$

${Mg}^{+ 2}$

$F^{-}$

${Na}^{+}$

answer is A.

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Detailed Solution

Even though all the given ions are electronic in nature but ion with largest radius is $O^{- 2}$ this is because the element oxygen has less number of protons (Z=8)

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