Does this sound natural?
"To make things more clear with an example here's the electronic configuration of oxygen.

As you can see, the first group of orbitals to be filled was 1s, then 2s and then 2p, but since oxygen only has eight electrons only the first orbital of the 2p group was completely filled, while the other two only have one electron each.

This electronic configuration can also be written as 1s²2s²2p⁴, since it has two electrons in 1s, two electrons in 2s and four electrons in 2p."