JEE Main & Advanced Chemistry Structure of Atom / परमाणु संरचना Question Bank Topic Test - Structure of Atom (4-5-21)

  • question_answer
    What is the electronic configuration of \[C{{u}^{2+}}(Z=29)\] of least position       

    A) \[[Ar]\,4{{s}^{1}}3{{d}^{8}}\]

    B) \[[Ar]\,4{{s}^{2}}3{{d}^{10}}4{{p}^{1}}\]

    C) \[[Ar]\,4{{s}^{1}}3{{d}^{10}}\]

    D) \[[Ar]\,3{{d}^{9}}\]

    Correct Answer: D

    Solution :

    [d] \[_{29}Cu=[Ar]\,3{{d}^{10}}4{{s}^{1}},\,C{{u}^{2+}}=[Ar]\,3{{d}^{9}}.4{{s}^{0}}\].
                Ground state of \[C{{u}^{29}}=1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}3{{d}^{10}}4{{s}^{1}}\]  \[C{{u}^{2+}}=1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{9}}\].


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