 Let's do another one of these molecular orbital theories problems building the molecular orbital diagram But this time let's do it with a period two element Beryllium, so here we're doing v e2. Okay, so how do I set that up? Remember, we're only using the Baylent's electrons So v e's Baylent's electrons are all stored in the what the 2s orbital, right? So we say 2s like that. We put the orbit So over to this side put an orbital 2s be so V e plus V e makes V e2. So we're cool. Is everybody okay with that? So in the be 2s orbital, how many electrons are there? Two? Two? One two and this one two one two So what do we do now? Write the bonding orbital, write the anti-bonding orbital So this one here, what do you think it's going to be called? Sigma 2s. Okay, the sigma 2s and this one's going to be called Sigma star Sigma star 2s So like we said, this is bonding. This is the anti-bonding. How many electrons are going to go into here? Two. Two, like that, and this one? Two, like that, right? So already, qualitatively, you shouldn't be able to tell me does this molecule exist or not? No. No, okay? But let's figure it out, you know, mathematically. So how do we do that? Using the bond order equation, the bond order is one half the bonding electrons Which is two minus the anti-bonding electrons, which is two. So what do we have? One half times zero Which equals zero. Okay, so that means that the bond order is zero So no bonds between this thing. Does it exist? No. Okay, so let's write the electron configuration for this theoretical molecule Well, the entire electron configuration also has that 1s stuff in it. So let's write that Sigma 1s2, right? Sigma star 1s2, because both of those inner orbitals are filled up. And then what do we have? Sigma 2s2 Sigma star 2s2 Would this molecule, this theoretical molecule, if it did exist, would it be attractive to a magnet at all? No. No. Why not? Yes, because you need an unpaired electron to be attracted to a magnet and sense all of our orbitals All of our orbitals are filled completely, right? No Magnetic attraction. Is everybody okay with this? So this is one of those things Paramagnetic diamagnetic that Bedford theory just doesn't tell us, right? We can only learn this using molecular orbital theory. Is everybody okay with that? Questions before I kill it?