• # question_answer The ionic radii of ${{N}^{3-}}$, ${{O}^{2-}}$, ${{F}^{-}}$ and $N{{a}^{+}}$ follow the order [MP PET/PMT 1998; MP PMT 2000] A) ${{N}^{3-}}>{{O}^{2-}}>{{F}^{-}}>N{{a}^{+}}$ B) ${{N}^{3-}}>N{{a}^{+}}>{{O}^{2-}}>{{F}^{-}}$ C) $N{{a}^{+}}>{{O}^{2-}}>{{N}^{3-}}>{{F}^{-}}$ D) ${{O}^{2-}}>{{F}^{-}}>N{{a}^{+}}>{{N}^{3-}}$

Solution :

As effective nuclear charge on $N{{a}^{+}}$ is maximum. It has smallest size.

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