And these guys aren't the same level. So that means they will be at the same level. So now, when I place electrons, I place them in the following way. The upward arrow represents the electron spin of plus one half. The downward arrow represents the electron spin of negative one half. So first I draw my up arrow, my down arrow, and I finished with the one s.
Next, I put two electrons into my two s. Upward arrow, downward arrow.