Orbitals with different levels of energy

[EvaLi_3J]

I'm a little confused as to how we should write electron configurations. I know that subshells in lower energy levels are sometimes filled after the higher energy level subshells. But as professor Lavelle said, we should still write it from lower energy levels to higher energy levels and from s to p right?

[Pablo 1K]

Yes that is correct the order is from s-p-d-f. Think of it as "building up" as suggested in the name.