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

  • question_answer The size of the following species increases in the order [IIT-JEE 1990; AFMC 1995]

    A) \[M{{g}^{2+}}<N{{a}^{+}}<{{F}^{-}}<Al\]

    B) \[{{F}^{-}}<Al<N{{a}^{+}}>M{{g}^{2+}}\]

    C) \[Al<Mg<{{F}^{-}}<N{{a}^{+}}\]

    D) \[N{{a}^{+}}<Al<{{F}^{-}}<M{{g}^{2+}}\]

    Correct Answer: A

    Solution :

      \[M{{g}^{2+}}<N{{a}^{+}}<{{F}^{-}}<Al\] \[{{F}^{-}}\] has bigger size than \[M{{g}^{2+}}\] and \[N{{a}^{+}}\] due to small nuclear charge.

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