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The ionic radii of $F^{-}$ and $O^{2 -}$ respectively are 1.33 $A^{0}$ & 1.4 A⁰, while the covalent radius of N is 0.74 $A^{0}$ . the correct statement for the ionic radius of $N^{3 -}$ from the following is :

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It is smaller than $O^{2 -}$ and $F^{-}$ , but bigger than of N

It is smaller than $F^{-}$ and N

It is bigger than $F^{-}$ and N, but smaller than of $O^{2 -}$

It is bigger than $O^{2 -}$ and $F^{-}$

answer is C.

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for isoelectronic species as negative charge increases , the size also increases.

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