 So let's name the following binary compounds of sulfur and oxygen. Okay, so all of these are covalent compounds, right? Because they're all nonmetal bonded with a nonmetal. So everybody see that? So we're going to use the covalent naming system for these molecules. So this one only has one of the initial atom, but we don't put the motto at the beginning, right? So this one's just called sulfur and then monoxide, okay? Because we have to indicate always the same. This one has more than one, so we have to indicate how many there are. So it's going to be di-sulfur-dioxide for what it is for five. If you can't remember, remember pentagon or something like that. Pentasulfur and then only one oxygen, so monoxide. Seven. Anybody got it on? Heptap. Heptap. And then di-oxide. And then sulfur tri-oxide. So I think if you remember the rules, the only problem you may have is what are these elemental symbols, if you don't know those yet. And you probably won't have any two weird ones on these ones. Any questions on this one? Okay.