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

  • question_answer
    The electronic configuration of chromium is [MP PMT 1993; MP PET 1995; BHU 2001; BCECE 2005]

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

    B)                 \[[Ne]3{{s}^{2}}3{{p}^{6}}3{{d}^{5}},4{{s}^{1}}\]

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

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

    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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