Question

What is hunds rule of multiplicity explain by taking example of nitrogen

Answer 1

according to this rule, electron pairing in orbital of same energy will not take place until each orbital has a single electron in it. e.g. Nitrogen has seven atomic number means seven electron.
electronic configuration is given as.
N(7)- 1s^2 2s^2 2px^1 2py^1 2pz^1
clearly p orbital of Nitrogen having 1 electron in it.

Answer 2

Hund’s rule for maximum multiplicity:

The Hund rule defines that for a given E.C, the term of lowest energy is the one with the highest value of spin multiplicity. This suggests that if two or extra orbitals of the same energy are obtainable, electrons will occupy them singly before satisfying them in pairs.

Example:

Nitrogen contains 7 electrons and its E.C shows that p orbital of nitrogen has one electron in it.

I hope it helped...