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

  • question_answer
    The explanation for the presence of three unpaired electrons in the nitrogen atom can be given by [NCERT 1979; RPMT 1999; DCE 1999, 2002; CPMT 2001; MP PMT 2002; Pb. PMT / CET 2002]

    A)                 Pauli's exclusion principle

    B)                 Hund's rule

    C)                 Aufbau's principle

    D)                 Uncertainty principle

    Correct Answer: B

    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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