Question

What is the Hund's rule in chemistry?

Answer 1

Answer:

Hund's Rule. Hund's rule: every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied, and all electrons in singly occupied orbitals have the same spin

Answer 2

Answer:

Hund's rule states that:

Every orbital in a sublevel is singly occupied before any orbital is doubly occupied.

All of the electrons in singly occupied orbitals have the same spin (to maximize total spin).

Hence the correct option is {b} i.e. In the orbitals of equivalent energy, pairing begins only after all the orbitals have been singly occupied