Question

Filling of electrons in the orbitals on a ground state atom is governed by three rules. 

(a) Which are the three rules? 

(b) State any one of them.

Answer 1

(a) (1) Aufbau principle 

(2) Pauli’s exclusion principle 

(3) Hund’s rule of maximum multiplicity 

(b) Hund’s rule of maximum multiplicity – electron pairing in orbitals of same energy will not take place until each degenerate orbital of a given subshell is singly occupied.