Question

clear all atoms prefer to have eight electrons in the valence shell. higher levels. electrons should fill atomic orbitals of the lowest available energy levels before occup all electrons must spin in the same direction every orbital must have 2 electrons before filling up the next orbital

Explanation:

The Aufbau principle states that electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels.

Answer:

Electrons should fill atomic orbitals of the lowest available energy levels before occupying higher levels.