 Okay, so let's try to figure out the charge on the manganese ion here, or the manganese atom in this polyatomic ion, Mn04-. Okay, so what we know about the entirety of the complex is that its overall charge is minus one. Is everybody okay with that? And we know also that oxygen prefers to have a what charge? Minus two, or two minus charge, right? So what we're wondering is what's the manganese charge, right? So we got that, so we got that, and we said this is two minus. But how many do we have? We've got four of them, so we've got an overall what? Negative eight. Okay, so we've got negative eight here, negative one here, they've got to balance out. So does negative eight equal negative one? No, so what do we have to do? We have to add seven, right? So what do you think manganese is charge is going to be? Plus seven, yeah, or seven plus, okay? So in this case, we'd write it like that, because minus eight plus seven equals minus one, okay? But if we wanted to talk about the oxidation state, and this is where it comes in, because it's not the formal charge of that particular atom, but it's the oxidation state of Mn is going to be seven plus, like that. Okay, is everybody okay with doing stuff like that? Are there any questions before I kill this video?