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