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

  • question_answer
    The electronic configuration of copper \[{{(}_{29}}Cu)\]  is           [DPMT 1983; BHU 1980; AFMC 1981; CBSE PMT 1991; MP PMT 1995]

    A)                 \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{9}},4{{s}^{2}}\]

    B)                 \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},4{{s}^{1}}\]

    C)                 \[1{{s}^{2}}.2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}},4{{s}^{2}}4{{p}^{6}}\]

    D)                 \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{10}}\]

    Correct Answer: B

    Solution :

                    3d subshell filled with 5 electrons (half-filled) is more stable than that filled with 4 electrons. \[1,\,4s\] electrons jumps into \[3d\] subshell for more sability.

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