So let's examine the electron configuration of Beryllium. So, Beryllium, in its neutral state, has four electrons, four protons, four neutrons. So the electron configuration goes like this. We have two electrons that go into our one S, and we have two electrons that go into the two S. Now, we also have the two p orbitals. But since we have no more electrons, there are zero electrons in the two P orbital. So we can either represent it this way, or we can simply remove the two P. Now, for my purposes, I'm going to leave it in this way, and we'll see why.