JEE Main & Advanced Chemistry Classification of Elements and Periodicity in Properties Question Bank Atomic and lonic radii

  • 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) \[{{N}^{3-}}<{{O}^{2-}}>{{F}^{-}}\]

    Correct Answer: A

    Solution :

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

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