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

  • question_answer Aufbau principle is obeyed in which of the following electronic configurations    [AFMC 1999]

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

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

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

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

    Correct Answer: A

    Solution :

                    According to Aufbau principle electron are filling increasing order of energy. Therefore the electronic configuration \[1{{s}^{2}}\,2{{s}^{2}}\,2{{p}^{6}}\] obeys Aufbau principle. 

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