 Okay, so we are presented with these three kind of orbital descriptions, okay? So these are parts of what you would see in an electron configuration. So, of course, an electron configuration would be much longer than this. This is just one little portion, and I want to focus on these so we can identify the parts of what we're seeing here, okay? So the things I want to identify are, so what is the principal energy level on all three of these, okay? What is the orbital type and how many electrons? So number of electrons in each of these. And we're just looking at the portion of these electron configurations that are pictured, okay? So in this case, we've got the 4p6 portion picture, okay? So remember, principal energy level is n, right? So that's like the first quantum number, and that's represented by this number that's in front of that orbital description, okay? So hopefully, you guys, if you would like to help me, if you don't want to, it's totally cool, okay? So n, or the principal quantum number in this 4p6, if we're looking at one of the electrons in this 4p6 portion, it would be 4, right? So is everybody fine with that? So it's on the fourth energy level is what we're really seeing, the electrons within this orbit, or this set up. Here, right, is on the second energy level, how do I know that? Because there's a 2 in front, okay? And then what would this one be? So that's the energy level that these things are at. So now we want to say, well, what orbital type is represented by this shorthand configuration, okay? So the orbital type, as you probably know, is represented right here by the letter, right? So in this one, it's a p orbital. This one, s orbital, and this one is a d orbital. Okay, so lastly we want to see how many electrons are there in each of these particular portions of the orbital diagram, okay? We can also figure out, if you want to, the number of orbitals in each of these. Well, if you want to think about it as p orbitals, they always have 3, okay? There's always 3 p orbitals in the subset, okay? S, do you guys remember how many? This is 1, just 1, always 1. And then d, do you guys remember that one? So you can look at the periodic table, yes, it's 5. So how am I getting that? I look at the periodic table, I look at the s block, and there's only those two elements. So remember, orbital, only two electrons can fit into one orbital, okay? So that's why I know there's only one s orbital. We'll go over this again, okay? I promise you we'll get this. Okay, so let's do the last portion of this part here, okay? So up here it's saying, it's telling us how many electrons are in those 3 orbitals altogether, okay? So that's 6, okay? So let's write that down. So since we have 6 electrons in 3 orbitals, all of the spots in those orbitals are used up, right? So in this case, we have 1 electron and 1 orbital, right? But there's how many spots in each orbital do we think? 2, right? So we can fit one more electron into this orbital here, okay? We just have it, right? So this symbol is representing only one electron being in that 2 s orbital, okay? Does that make sense? Okay. And then this one, right? So since there's 5 orbitals, what would be the maximum amount of electrons we could put in? 10, right? But it's saying that we have 7 of them in there, right? So what that's saying is that not all of them are filled up, right? In fact, in this case, only 2 of them are filled up. The other 3, so if you wanted to think about it, right? If you're thinking that this is my 3D orbital system, so we're doing a condensed electron diagram or atomic orbital diagram, right? It'd be using Hunt's rule, right? 1, 2, 3, 4, 5. And then Pauli exclusion principle, 1, 2. That's 7, right? So we see 1, 2 orbitals are completely filled in the other 3, okay? So are we okay with at least looking at these symbols here and being able to write all of this stuff down? Is that it? Are there any questions on this question? Okay, we're going to build up from here, okay? We're going to write out big, now we're going to start doing the electron configurations, okay? Writing the whole thing down. So we'll say, I don't know, what's the electron configuration of aluminum or something like that? Any questions? You have a question? I just wanted to say you need to look at the periodic table. Do you have 5? I don't know what you're looking at. Okay, so okay, let's do that. We'll record me looking at the periodic table and I'll show you, okay?