Which one of the following is the smallest in | vedclass

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(D) . $Na^{+} < F^{-} < O^{2-} < N^{3-}$All these ions are isoelectronic,meaning they contain the same number of electrons ($10$ electrons).For isoele

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$Na^{+}$

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(D) . $Na^{+} All these ions are isoelectronic,meaning they contain the same number of electrons ($10$ electrons).For isoelectronic species,the ionic radius decreases as the atomic number $(Z)$ increases because the effective nuclear charge increases.Since the atomic numbers are $N(7)$,$O(8)$,$F(9)$,and $Na(11)$,the effective nuclear charge is highest for $Na^{+}$,resulting in the smallest ionic size.

Which one of the following is the smallest in size?

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