And in this case, our lowest unoccupied molecular orbital is the antibonding Sigma Bond. Remember, the bonding Sigma Bond is completely filled. The antibonding has no electrons, and so that means it must be the lowest unoccupied molecular orbital. Likewise, in this step, this was our lumo lowest unoccupied molecular orbital. And this was our homo, the Lewis base. So let's look at the second more closely in terms of energy.