JEE Main & Advanced Chemistry Structure of Atom Question Bank Quantum number, Electronic configuration and Shape of orbitals

  • question_answer What is the electronic configuration of \[C{{u}^{2+}}(Z=29)\] of least position     [MP PET/PMT 1998; MP PET 2001]

    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 :

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