JCECE Engineering JCECE Engineering Solved Paper-2005

  • question_answer
    The observation that the ground state of nitrogen atom has \[3\] unpaired electrons in its electronic configuration and not otherwise is associated with:

    A)  Pauli's exclusion principle

    B)  Hund's rule of maximum multiplicity

    C)  Heisenberg's uncertainty principle

    D)   Ritz combination principle.

    Correct Answer: B

    Solution :

    Key Idea: (i) Hund's rule of maximum multiplicity: States that pairing of electrons in an orbital starts only when each of them has received one electron each. (ii) Heisehberg's uncertainty principle: States that position and momentum of an electron cannot be measured accurately and simultaneously. (iii) Pauli's exclusion principle: States that no two electrons of same atom can have all 4 quantum number values identical. \[\therefore \]Presence of \[3\] unpaired electrons in electronic configuration of nitrogen is associated with Hund's rule of maximum multiplicity.


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