Question

multiple choice question
according to which of the following must single electrons with the same spin occupy each equal - energy orbital before additional electrons with opposite spins can occupy the same orbitals?
the aufbau principle
the pauli exclusion principle
hunds rule
the octet rule

Explanation:

Hund's rule states that single electrons with the same spin occupy each equal - energy orbital before additional electrons with opposite spins can occupy the same orbitals. The aufbau principle is about filling orbitals in order of increasing energy. The Pauli exclusion principle states that no two electrons in an atom can have the same set of four quantum numbers. The octet rule is about atoms having eight electrons in their valence shell for stability.

Answer:

C. Hund's rule