Question

electron configuration quiz
cp chemistry a o / module 4: electronic structure and periodicity

1. what statement supports aufbaus principle for electron filling?

fill the highest energy orbital first of the orbital - filling chart before filling in other orbitals.
electrons in the same electron orbital may have a negative orientation ($-\frac{1}{2}$) and a positive orientation ($+\frac{1}{2}$).
all energy orbitals with the same energy must get one electron before receiving a second.
electrons will always fill the lowest energy orbitals first.

Explanation:

Aufbau's principle states that electrons fill the lowest energy orbitals first. This is a fundamental concept in electron configuration. The other options are incorrect: filling the highest energy orbital first is the opposite of Aufbau's principle; electrons in the same orbital having negative and positive orientations relates to the Pauli exclusion principle; and all energy orbitals with the same energy getting one electron before a second relates to Hund's rule.

Answer:

Electrons will always fill the lowest energy orbitals first.