Now, so I place one here, one here, one here, and then I place my fourth one into my X. So we can also represent this guy in the following way. We simply erase all these X's as ZS and simply say two P and we place a four on top. Now, whenever we do this, we make the assumption that you understand the fact that this is not a single orbital but this is actually three orbitals. Because if this was a single orbital, the four would not make sense because you could only place the maximum of two electrons into any orbital according to the Pole Exclusion Principle. So that's the electron configuration.