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

  • question_answer Which of the following electronic configurations is not possible [CPMT 2000]

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

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

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

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

    Correct Answer: D

    Solution :

                    When 2p orbital is completely filled then electron enter in the 3s. The capacity of 2p orbital containing \[{{e}^{-}}\]is 6. So \[1{{s}^{2}},\,2{{s}^{2}}2{{p}^{2}}3{{s}^{1}}\] is a wrong electronic configuration the write is \[1{{s}^{2}}2{{s}^{2}}2{{p}^{3}}.\]

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