 Okay. So let's do this one that says, or it says, I'm making it up, using molecular orbital theory, decide whether this molecule exists or not, okay? So what we have to do is remember, of course, molecular orbital theory, we're dealing with only the valence electrons, okay? So in this molecule, it's Li2, so that means it's a one lithium bonding to another lithium, because everybody okay with that? So we can say, and if we think about the atomic orbitals that lithium has, right, it's just the valence shell, it's the 2x orbital, just believe for both of them, and in each of these lithium, lithium, I don't know, lithiums, would be one valence electron, okay? So the bonding orbitals for the first bond is going to be a sigma bond, right? So there's going to be, for every bonding orbital, we have an anti-bonding orbital. So we're going to have, so down here, we're going to have the two sigma bonding orbital, or the sigma, sorry, the sigma 2s bonding orbital, and up here, we're going to have the sigma star 2s bonding orbital, and now there's a lot of questions on that. So somebody was like, what was that, cuneiform or whatever, so anyways, they go to the lowest and the question is, what this molecule exists, okay? And so in order to do that, you've got to figure out what the bond order is, the formula for you, the bond order is one half the bonding electrons minus the anti-bonding electrons. The bonding electrons is the ones that are in the non-starred orbitals. So bonding electrons is going to be 2, and anti-bonding electrons are in the starred orbitals, and in that case, it's going to be zero, so the bond order is going to be one. Remember, if it's over zero, then it exists, right? So, does this exist or not? Yes. Okay, are there any questions on this one? So, do you have a question? No. Kill it?