Column - I (Ground state configuration)		Column – II (Rule violated)
I		A	Hund’s only
II		B	Aufbau only
III		C	Pauli only
IV		D	Hund’s and Pauli’ only
V		E	Hund’s and Aufbau only
		F	Aufbau, Hund’s and Pauli
		G	No rule violated

 

I) 1s - two electrons with parallel spin - Violation Pauli’s exclusion principle
II) In 2p - one of the half - filled degenerate orbital has opposite instead of parallel spin - Hund’s rule violated
III) Only Aufbau rule is violated
IV) Before filling 2s, electron entered into 2p - Aufbau rule violated
V) No rule is violated