 Okay, so let's try this problem. It says write the predicted electron configuration for the following element. And then it gives you nickel, okay? So in order to do this particular problem, you're going to have to remember what the chemical symbol for nickel is, the atomic symbol for nickel. You remember that? Yes. What is it? Ni. Ni, okay, very good. So Ni. And then all we do is look at our periodic table and just go down the different periods, right? And decide if or what the electron configuration is for each one. So the first one is the first period, so that's called one. And remember, the first set of orbitals is called S. So in nickel, we've got to go all the way up to 28, okay? So we've got to add up all our numbers to 28, okay? So all of our superscripts to 28. So this one, first, we're going to always start with 1S2, okay? So the superscript 2 there, okay? So those things are going to add up to 28, okay? So after 2, we go down to our next period, okay? So then we're at 2S2, okay? Then we'll do 2P6, okay? Then 3S2. Are you following me? Okay. Can everybody else, can anybody else help me with this? What would be next after 3S2? 3T6, right? Are we to 28 yet? No. So what's next? 4S2, right? And then what? 3D. But not 10, right? Because nickel's in that period, right? In that set of orbitals. So it's going to be 3D2468. So that's the electron configuration for nickel. Are there any questions? Okay. Any questions on that one? My question isn't necessarily about that, but like you asked the question about the excited state, and I think I messed that up on the test. Don't worry about that, okay? So we'll talk about that in another video, okay? Any other questions on this? Okay.