Which of the following states that an orbital can contain two electrons only if all other orbitals at that sublevel contain at least one electron?

Question

A.
Archimedes' principle
B.
Aufbau principle
C.
Hund’s rule
D.
Pauli exclusion principle
E.
Le Chatelier's principle

Answer 1

The correct answer is C. Hund’s rule.

Hund's rule states that electrons will occupy degenerate orbitals (orbitals of the same energy) singly before pairing up in any one orbital; this means that an orbital can only contain two electrons if all other orbitals at that sublevel contain at least one electron.