So let's once again draw our electron configuration for oxygen. So we have one s. So two electrons go to the one s.
We have two s, two electrons go to the two s. We have two PX and two PY and two PV. So two go in here, one goes in here, and one goes in the last two PZ. Now, once again, we draw out the full atomic orbital picture for our oxygen. So two go into the one S, which we did not draw because it's within our two S. So two go into the two S.
So here's our sphere to go inside the two S, two go to the two PX. So two go into the two PX.