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9th Class Science Structure of the Atom Question Bank Structure of the Atom

  • question_answer
    Which of the following ions is the smallest in size?

    A) \[M{{g}^{2+}}\]           

    B)        \[N{{a}^{+}}\]

    C) \[{{O}^{2-}}\]            

    D)        \[{{F}^{-}}\]

    Correct Answer: A

    Solution :

     All the ions are isoelectronic, so size depends on the number of protons (size is inversely related to number of protons). \[M{{g}^{+2}}\] has more number of protons compared to all the other ions. Hence,\[M{{g}^{+2}}\]is the smallest ion.


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