Question

If the nitrogen atom had electronic configuration $1{\text{s}}^7$ , it would have energy lower than that of the normal ground state configuration $1{\text{s}}^{2}2{\text{s}}^{2}2{\text{p}}^3$ because the electrons would be closer to the nucleus. Yet $1{\text{s}}^7$ is not observed because it violates

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

Answer 1

Answer: (C)

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