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  4. Which one among the following ions, is smallest in size

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Q. Which one among the following ions, is smallest in size

NTA AbhyasNTA Abhyas 2022

Solution:

$Na^{+} < F^{-} < O^{2 -} < N^{3 -}$ , All are isoelectronic species, hence effective number charge is highest for $Na^{+}$ so, it has smallest size among the given ions.
Size of ion is inversely proportional to effective nuclear charge.