If the nitrogen atom had electronic configuration `1 s^(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. It violates

Options

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

Answer

C

Explanation

Not more than two electrons can be present in same atomic orbital. This is Pauli's exclusion principle.