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 according to Hund?s rule                  [Kerala PMT 2004]

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

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

    C)                 \[1{{s}^{2}}2{{s}^{2}}2p_{x}^{1}2p_{y}^{1}2p_{x}^{1}\]

    D)                 \[1{{s}^{2}}2{{s}^{2}}2p_{x}^{2}\]

    E)                 \[1{{s}^{2}}2{{s}^{2}}2p_{x}^{2}2p_{y}^{1}2p_{z}^{1}\]

    Correct Answer: D

    Solution :

                    According to Hund's rule electron first fill in unpaired form in vacant orbital then fill in paired form to stabilized the molecule by which \[1{{s}^{2}},2{{s}^{2}},2p_{x}^{2}\] is not possible. According to Hund's rule. Because \[2{{p}_{x}},{{p}_{y}},{{p}_{z}}\] have the same energy level so electron first fill in unpaired form not in paired form so it should be \[1{{s}^{2}},\,2{{s}^{2}},\,2p_{x}^{1},2p_{y}^{1}\].

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