Question

what rule/principle states that electrons fill orbitals from lowest energy to highest energy?
○ aufbau principle
○ hund’s rule
○ pauli exclusion principle
done ✔

Explanation:

The Aufbau principle states that electrons occupy orbitals in order of increasing energy (from lowest to highest). Hund’s rule is about electron pairing in degenerate orbitals, and the Pauli exclusion principle is about no two electrons having the same quantum numbers. So the rule for filling orbitals from lowest to highest energy is the Aufbau principle.

Answer:

A. Aufbau principle