Nitrogen has the electronic configuration $1s^2 2s^2 2p_x^1 2p_y^1 2p_z^1$ and not $1s^2 2s^2 2p_x^2 2p_y^1 2p_z^0$,which is determined by:

• A
  Aufbau's principle
• B
  Pauli's exclusion principle
• C
  Hund's rule
• D
  Uncertainty principle