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Punjab Medical Punjab - MET Solved Paper-2008

  • question_answer
    The atomic number of an element \[M\] is 26. How many electrons are present in the M-shell of the element in its\[{{M}^{3+}}\]state?

    A)  11                                         

    B)  15

    C)  14                                         

    D)  13

    Correct Answer: D

    Solution :

                K           L                    M                   N M(26)  \[1{{s}^{2}}\],     \[2{{s}^{2}}2{{p}^{6}}\],  \[3{{s}^{2}}3{{p}^{6}}3{{d}^{6}}\]\[4{{s}^{2}}\] \[{{M}^{3+}}\]     \[1{{s}^{2}}\],    \[2{{s}^{2}}2{{p}^{6}}\] ,\[3{{s}^{2}}3{{p}^{6}}3{{d}^{5}}\]  \[4{{s}^{0}}\] Hence, 13 electrons are present in the \[M-\]shell of\[{{M}^{3+}}\]state.


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