Question

The three unpaired electrons in the last subshell of nitrogen are related to the following law:

• A. Hund's law
• B. Aufbau law
• C. $(n+1)$ law
• D. Pauli's exclusion law

Answer 1

The correct option is A Hund's law

The three unpaired electrons in last subshell of nitrogen are related to the Hund's rule of maximum multiplicity.
The electronic configuration of nitrogen is $1s^{2}2s^{2}2p^3$.
The three electrons present in the 2p orbital are unpaired as they occupy the orbitals singly and paring will occur only if fourth electron is added.