 Hello, this is Professor Stephen Ashburn. I'm here to help you out with some of these Spartan calculations for the hydrogen molecule. So to get us started, what we're going to start with trying to create here is a reaction progress diagram, which I'm showing you right here. And to do that, we need to calculate the energy of a single hydrogen atom. And then we'll multiply that by 2 because there's two of them to start with. And then in the end, we want the energy of a hydrogen molecule. So that's the energies of the reaction progress diagram. So how are we going to get that? Well, one of them is I want to look at the, I want to build a single hydrogen atom. So I clicked over there. And I'm going to get rid of this little oven here because I just want a single hydrogen atom. And let's see, I'm going to go to the calculations menu. And in order to do this, for single atoms, you just get a single energy. And it turns out there's one unpaired electron and a hydrogen atom. So I'm just going to save this somewhere. And as soon as that's done, we'll start to look at those energies. So just to remind you, we're going to, we're trying to get this energy here, which would be twice the energy of a single hydrogen atom. And now it's done. So here's the number that I need. It's easy to go to this icon here. And the energy is minus 0.4967 atomic units. And that, we could probably round that up to minus 0.5. And so that's the energy of that first point here, except times 2, because there's two hydrogen atoms. Now, what about the next bit? Well, I want to make a, I want now look at the hydrogen molecule. So since that's going to default to another hydrogen, I'm kind of good to go on this. And I want the equilibrium geometry. Everything else is fine. So I'm just going to save this somewhere. And again, what we're looking for now in this diagram is I'm looking for this energy, which will just be the energy of a hydrogen molecule. OK, that's done. So now I can go over here. And I can see that that's minus 1.16 or something atomic units. So that's what's going to go into that lower right part of that reaction progress diagram.