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Manipal Engineering Manipal Engineering Solved Paper-2012

  • question_answer
    Which of the following species have the same number of electrons in its outermost as well as penultimate shell?

    A) \[C{{l}^{-}}\]      

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

    C) \[N{{a}^{+}}\]                   

    D)        \[M{{g}^{2+}}\]

    Correct Answer: A

    Solution :

    \[C{{l}^{-}}=2,\,8,\,8\] \[{{O}^{2-}}=2,\,8\] \[N{{a}^{+}}=2,\,8\] \[M{{g}^{2+}}=2,\,8\]                \[C{{l}^{-}}\] contains same number of electrons in outermost and penultimate shells.


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