Question

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

• A. Heisenberg uncertainty principle
• B. Hund's rule
• C. Pauli exclusion principle
• D. Bohr postulate of stationary orbits

Answer 1

Answer: (C)

$1s^7$ violate Pauli exclusion principle, according to which an orbital cannot have more than two electrons.