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

  • question_answer The radii of \[F,\,{{F}^{-}},\,O\] and \[{{O}^{-2}}\] are in the order of [AIIMS 1999; CPMT 1999]

    A) \[{{O}^{2-}}>{{F}^{-}}>O>F\]

    B) \[{{O}^{2-}}>{{F}^{-}}>F>O\]

    C) \[{{F}^{-}}>{{O}^{2-}}>F>O\]

    D) \[{{O}^{2-}}>O>{{F}^{-}}>F\]

    Correct Answer: A

    Solution :

      Atomic radius decreases on going from left to right in a period. Thus size of \[O>F\]. As \[{{O}^{2-}}\] and \[{{F}^{-}}\]are isoelectronic, therefore, size of \[{{O}^{2-}}>{{F}^{-}}.\]

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