 talking about what we just did. So in these compounds we're going to identify whether they're an oxide, a peroxide, or a superoxide, and then we're going to name these compounds. Okay? So I want you to help me out. The first thing I'm going to do is write over here what an oxide is, a peroxide, and a superoxide. Okay? So oxide, what does that mean? O2-mine. Very good. Peroxide? O2-mine. Yeah. O2-mine. And a superoxide. O2-mine. O2-mine. Like that. So is everybody okay with that stuff? Memorize those things. Okay. So, is this compound an oxide per oxide or superoxide? How do we go about figuring that out? Let's do it this way. We'll put cation. We'll make a table for it. What's the cation in this compound? Is that a cation? Is it just rubidium? That sounds like an atom to me. Is it plus 2? How do I figure it out? It's rubidium plus, right? Rb plus. But there's two of them, like that. Right? So what's the charge of oxygen? What kind of oxygen do we have? It's an O, what is it? 2-minus, right? So what kind of oxygen is that? Peroxide. So peroxide, right? So the name of this compound is going to be what? Rubidium. Okay, what's doing that? So the next one, and we're going to do it the same way, okay? So what's the cation here? C2-minus. C2-minus. C2-minus. C2-minus. That's bad already. And anion? O2-minus. So what kind of compound is this? Oxide. That's an oxide, so what's the name of it? Calcium. Oxide, yeah. Okay, what about this one? So what's the cation? CS plus, very good. And then the anion must be what? O2-minus. So that means it's a what? Superoxide, so what's the name? C-vm. Superoxide. What about SRO2? What is the cal? SRO2 plus. So that means oxygen is what? O2-minus. What is that? Peroxide. So what do we got? Trontium. Last one. What's its name? I know you guys know its name. Carbon dioxide. Carbon dioxide. So what's-