Question

If the electronic distribution of oxygen atom is given as
,
then it would violate:

• A. Hund's rule
• B. Pauli's exclusion principle
• C. Both Hund's and pauli's principles
• D. None of the above

Answer 1

The correct option is A Hund's rule

(a) According to Hund's rule, electron pairing in an orbital cannot occur until each orbital of a given subshell contains one electron each or is singly occupied.

(b) The Pauli Exclusion Principle states that, in an atom or molecule, no two electrons can have the same set of four quantum numbers. As an orbital can contain a maximum of only two electrons, the two electrons must have opposite spins and doesn't violate pauli's exclusion principle.

Hence, it violates Hund's rule only.