MCQ
If the nitrogen atom had electronic configuration $1s^7,$ it would have energy lower than of the normal ground state configuration $1s^2 ,2s^2 ,2 p^3$ because the electron would be closer to the nucleus. Yet $1s^7$ is not observed because it violates
- AHeisenberg’s uncertainty principle
- BHund’s rule
- ✓Pauli’s exclusion principle
- DBohr postulate of stationary orbit