Question

what rule/ principle states that electrons in the same sublevel (p, d, or f) are placed in individual orbitals, before they are paired up, to increase atomic stability?

auffbau principle

hunds rule

pauli exclusion principle

Explanation:

Hund's rule states that electrons in the same sublevel occupy individual orbitals with parallel spins before pairing up to maximize stability. The Aufbau principle deals with the order of filling orbitals, and the Pauli - exclusion principle states that no two electrons in an atom can have the same set of four quantum numbers.

Answer:

B. Hund's rule