Chemistry - GENERAL CHEMISTRY Question with Solution | TestHub

Hund's rule states that 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. This rule applies when there are multiple degenerate orbitals (orbitals of the same energy) within a subshell.

- p-subshell has 3 degenerate orbitals ($p_x,p_y,p_z$).

- d-subshell has 5 degenerate orbitals ($d_{xy},d_{yz},d_{xz},d_{x^2-y^2},d_{z^2}$).

- f-subshell has 7 degenerate orbitals.

The s-subshell has only one orbital, so there are no degenerate orbitals for Hund's rule to apply.

The final answer is $\boxed{C}$