Among the ions O^{2-}, Na^{+}, F^{-}, N^{3-}, | vedclass

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(B) The given ions $O^{2-}, Na^{+}, F^{-}, N^{3-}, Mg^{2+}$ are isoelectronic species,as each contains $10$ electrons.For isoelectronic species,the io

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$Mg^{2+}, N^{3-}$

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(B) The given ions $O^{2-}, Na^{+}, F^{-}, N^{3-}, Mg^{2+}$ are isoelectronic species,as each contains $10$ electrons.For isoelectronic species,the ionic radius decreases as the nuclear charge (number of protons) increases.The number of protons in these ions are: $N^{3-} (7), O^{2-} (8), F^{-} (9), Na^{+} (11), Mg^{2+} (12)$.Since $Mg^{2+}$ has the highest nuclear charge ($12$ protons),it has the smallest ionic radius.Since $N^{3-}$ has the lowest nuclear charge ($7$ protons),it has the largest ionic radius.Therefore,the ions with the smallest and largest radii are $Mg^{2+}$ and $N^{3-}$ respectively.

Among the ions $O^{2-}, Na^{+}, F^{-}, N^{3-}, Mg^{2+}$,the ions with the smallest and largest radii are respectively:

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