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AMU Medical AMU Solved Paper-2006

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

    A)  \[M{{g}^{2+}}\]                              

    B)  \[{{O}^{2-}}\]

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

    D)  \[C{{a}^{2+}}\]

    Correct Answer: D

    Solution :

                     \[_{20}Ca=2,\,\,8,\,\,8,\,\,2\] \[C{{a}^{2+}}=2,\,\,8,\,\,8\] Hence, \[C{{a}^{2+}}\] has 8 electrons each in outermost  and penultimate shell.


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