If the electronic structure of oxygen atom is written as
It would violate :

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Pauli’s exclusion principle

Both Hund’s and Pauli’s principles

None of above

Hund’s rule

answer is A.

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Detailed Solution

When degeneracy orbitals are available for an atom, then each one must filled with single electron after that pairing is takes place. Here, Hund’s rule is violated.

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