 Okay. Let's try this next one. What does it say? Which ion has a negative one charge? How about we just go through these ions and figure out what the charges are on each of them, okay? So we know what's the charge on this one there, all right? What is it? Minus one. What is it? Minus one. Uh-huh. Minus two. Negative two. Yeah. Okay. So what about this one up here? Plus one. Yes. So we just put the plus. What about this one over here? How about this one over here? This one's easier, right? Yeah. What's one we supposed to really know? Negative one. Negative two. What do you think this one is? It's a negative one. Yeah. It's got to be negative one, right? Because that's the answer, okay? So that's the one that has the negative one. Okay. Any questions on that one? I think this one is... The way you want to look at this one is, okay, remember the list of common ions that I told you to memorize? This one, this one, and this one are all on it, okay? So since we know those charges, this one has to be the one that's left.