 Okay, so what is the quantum numbers for the 8th electron in oxygen? Okay, can you guys do that? So the 8th electron. Okay, so help me out. What's n? Two. Very good. Was that a guess? No. No, you knew that. Okay, good. Okay, so two. Somebody else help me out. What's L? D. How would you figure that out? It's two. So it's one, right? Why is it one? It goes zero, one. Zero, one, two, three. So if it's a p orbital, it's one. And this one's in, so what is this? It's the 2p, the fourth electron and 2p, right? If you want to, you can write the electron configuration. That might fire the orbital diagram. That might also help you to sp, right? Let's fill this one up together. How do we do this? So oxygen needs four electrons, right? So where are we going to put the first one? Right here. There. And the second one? Next one. Next one, right? And this one? Yes. And then, so what's M sub L? Negative one. Negative one. How did I figure that out? It's the first one. It's negative one, zero, one. This one's negative one, zero and one. Do you guys remember what these orbitals are called? So there was a quiz question kind of like that. Showed an orbital and said, what is this orbital called? So their p x, y and z would be the way to call it. You guys know that. So there's the 2px, the 2py, the 2pc. They're not necessarily in this order, but they fill in that order. But there's one on the x-axis, one on the y-axis, one on the z-axis. So we call it. Oh, are you talking about like this? Yes. Definitely. Okay, so what did we say this one was? Negative one. Why? Because we're concentrating on that electron. Okay, what's the spin? Negative one. Well, okay, normally, yes, you would say negative one-half. And in fact, if you rub that, it would be, I would say correct, you know? In fact, if you put positive one-half, it would also be correct, okay? Because you don't really know which way the first electron went in, okay? So if the electron went in upside down, then that would be negative and the second one would be positive, okay? But it is convention to say that the second one is the negative one, okay? So you guys are pretty cool with that? So that's the eighth electron. The seventh electron, would that have different or the same quantum numbers? Different. Different, right? Different. Almost the same. A lot the same, right? But a little bit different, yeah. Yeah, there's some things that are, yeah, but n and l will be the same, right? But n and l will be different, right? That would be, let's do, let's do the seventh one. So that was the eighth, let's do the seventh one. So n would be two, l would be one, what's n sub n? One. One, and n sub s? Positive. Positive one-half, if we're doing our little convention that we were second, right? And if I did another electron, hopefully you guys could do this, right? Do we have to do any more of these? For oxygen. We can do more on Friday. Any questions on this? No.