Chhattisgarh PMT Chhattisgarh PMT 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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