• # question_answer The order of the magnitude of ionic radii of ions ${{N}^{3-}},{{O}^{2-}}$ and ${{F}^{-}}$is [MP PMT 1996] A) ${{N}^{3-}}>{{O}^{2-}}>{{F}^{-}}$ B) ${{N}^{3-}}<{{O}^{2-}}<{{F}^{-}}$ C) ${{N}^{3-}}>{{O}^{2-}}>{{F}^{-}}$ D) ${{N}^{3-}}<{{O}^{2-}}>{{F}^{-}}$

${{N}^{3-}}>{{O}^{2-}}>{{F}^{-}}$. All are isoelectronic but nuclear charge per electron is highest for ${{F}^{-}}$, so it has smallest size.