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

  • question_answer Which of the following electronic configuration is not possible    [MHCET 2003]

    A)                 \[1{{s}^{2}}2{{s}^{2}}\] 

    B)                 \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}}\]

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

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

    Correct Answer: D

    Solution :

                    We know from the Aufbau principle, that 2p orbital will be filled before 3s orbital. Therefore, the electronic configuration \[1{{s}^{2}},\,2{{s}^{2}},\,2{{p}^{2}},\,3{{s}^{1}}\] is not possible.

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