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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