Question

question 23 (1 point)
what is the aufbau principle?
an atom is built up by the addition of electron starting at the highest available energy orbital.
an atom is built up by the addition of electron starting at the lowest available energy orbital.
the lowest energy configuration for an atom has the lowest number of unpaired electrons.
the lowest energy configuration for an atom has the greatest number of unpaired electrons.
question 24 (1 point)

Explanation:

The Aufbau principle states that electrons fill the lowest - energy orbitals first when building up an atom. This is a fundamental concept in understanding electron configurations.

Answer:

An atom is built up by the addition of electron starting at the lowest available energy orbital.