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CMC Medical CMC-Medical Ludhiana Solved Paper-2010

  • question_answer
    The species which has the same number of electrons in the outermost as well as penultimate shell is

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

    B)  \[C{{a}^{2+}}\]

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

    D)  \[M{{g}^{2+}}\]

    Correct Answer: B

    Solution :

                    \[C{{a}^{2+}}\]has the electronic configuration 2, 8, 8 but \[M{{g}^{2+}},{{O}^{2-}}\] and \[{{F}^{-}}\]are all isoelectronic with the configuration 2, 8.


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