 Okay, so let's do another one of these coordination complex, naming it. So hopefully you can see already that this one is actually a salt of a coordination complex because we've got this sodium atom in front of there. So this coordination complex comes from the formation of the sodium ion with this gold complex there. Okay, so this is the actual complex ion there. So that's an actual complex. So how do we name these? Well first you want to put the name of the ionic metal first. Okay, so we call this sodium. And then we do the regular naming rules. Okay, so let's erase this portion to get that out of our way. And so let's just think of this. So remember, we do the ligands first and before that we put the prefix. Right? Okay, so in this case it's going to be tetra. And fluorine, right, is the negatively charged ligand. Okay, so we're going to have to change the name. Fluoro, that's now fluoro. So tetra fluoro, and then gold is one of those weird ones. It's orate. And remember, fluorine is negatively charged. So if you want to, you can even do it again. Right, so we've got four F-minuses like that. So if the whole thing is minus charged, then that must mean the gold must be 3+. So, in parentheses, we put a 3, okay? So this is called sodium tetrafluoroporate 3. Any questions on that one? Oh, and then I have built a compound here. So if you imagine the fluorines to be the green atoms there, the gold, here's the sodium, it's just the counter ion. The gold to be the silver atom there. You can see that this AUF4 minus complex ion is also a square planar, okay, with the 90-degree angles between the bonds, okay? Any questions on this one?