Medium
If the electronic configuration of a nitrogen atom were $1s^7$,its energy would be lower than the ground state configuration $1s^2 2s^2 2p^3$ because the electrons would be closer to the nucleus. However,the configuration $1s^7$ is not observed. Which of the following principles is violated?
- AHeisenberg uncertainty principle
- BHund's rule
- CPauli exclusion principle
- DBohr's postulates of stationary orbits
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