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

  • question_answer
    The correct ground state electronic configuration of chromium atom is  [IIT 1989, 94; MP PMT 1993; EAMCET 1997; ISM Dhanbad 1994; AFMC 1997; Bihar MEE 1996; MP PET 1995, 97; CPMT 1999; Kerala PMT 2003]

    A)                 \[[Ar]\,3{{d}^{5}}\,4{{s}^{1}}\]  

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

    C)                 \[[AR]3{{d}^{6}}4{{s}^{0}}\]       

    D)                 \[[Ar]4{{d}^{5}}4{{s}^{1}}\]

    Correct Answer: A

    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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