MCQ
The ionic radii of $\mathrm{F}^{-}$ and $O^{2-}$ respectively are $1.33\, A^o$ and $1.4\, A^o$, while the covalent radius of $\mathrm{N}$ is $0.74\,A^o$ 

The correct statement for the ionic radius of $\mathrm{N}^{3-}$ from the following is :

  • A
    It is bigger than $\mathrm{F}^{-}$and $\mathrm{N}$, but smaller than of $\mathrm{O}^{2-}$
  • B
    It is smaller than $\mathrm{O}^{2-}$ and $\mathrm{F}^{-}$, but bigger than of $\mathrm{N}$
  • It is bigger than $\mathrm{O}^{2-}$ and $\mathrm{F}^{-}$
  • D
    It is smaller than $\mathrm{F}^{-}$and $\mathrm{N}$

Answer

Correct option: C.
It is bigger than $\mathrm{O}^{2-}$ and $\mathrm{F}^{-}$
c
$\mathrm{F}^{-}, \mathrm{O}^{2-}$ and $\mathrm{N}^{3-}$ all are isoelectronic species inwhich $\mathrm{N}^{3-}$ have least number of protons due to which it's size increases as least nuclear attractionis experienced by the outer shell electrons. Size order $\mathrm{N}^{3-}>\mathrm{O}^{2-}>\mathrm{F}^{-}$

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