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RAJASTHAN PMT Rajasthan - 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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