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

  • question_answer Nitrogen has the electronic configuration \[1{{s}^{2}},2{{s}^{2}}2p_{x}^{1}2p_{y}^{1}2p_{z}^{1}\] and not \[1{{s}^{2}},2{{s}^{2}}2p_{x}^{2}2p_{y}^{1}2p_{z}^{0}\]   which is determined by [DPMT 1982, 83, 89; MP PMT/PET 1988; EAMCET 1988]

    A)                 Aufbau's principle           

    B)                 Pauli's exclusion principle

    C)                 Hund's rule        

    D)                 Uncertainty principle

    Correct Answer: C

    Solution :

                    Hund?s rule states that pairing of electrons in the orbitals of a subshell (orbitals of equal energy) starts when each of them is singly filled.

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