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

  • question_answer Which one of the following is expected to have largest size [UPSEAT 2004]

    A) \[{{F}^{-}}\]

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

    C) \[A{{l}^{+3}}\]

    D) \[{{N}^{-3}}\]

    Correct Answer: D

    Solution :

    Due to having three electrons atomic size increases. \[{{F}^{-}}=9+1=10\] electrons ; \[{{O}^{-2}}=8+2=10\] electrons \[Al+3=13-3=10\] electrons ; \[{{N}^{3-}}=7+3=10\,{{e}^{-}}.\] Because electrostatic force between nucleus and \[\bar{e}\] cloud is least in nitrogen.

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