If the electronic configuration of nitrogen had 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 vilates:

If the electronic configuration of nitrogen had 1s^(7), it would have

1.	If the electronic configuration of nitrogen had 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 vilates:
Answer» Heisenberg UNCERTAINTY principle Hund's rule Pauli's exclusion principle Bohr postulates of STATIONARY orbits Answer :C