Here, you will learn about Hund’s Rule of Maximum Multiplicity.
Hund’s Rule of Maximum Multiplicity
On the basis of magnetic measurement Hunds put forward a rule for determining the ground state electronic configuration of atoms and this rule is known as Hund’s rule of maximum multiplicity. According to this rule, “Electrons enter into the degenerate atomic orbitals in such a way as to contain a maximum of unpaired electrons and with their spins parallel.” Such an arrangement corresponds to minimum electrostatic repulsion between the electrons and so the electronic configuration becomes stable. As an illustration, a system with three P electrons will have one electron in different P orbitals with spins parallel. The same principle applies to the d and f orbital for finding out the ground state electronic configuration.