 So, let's see if copper in its common ion, or its plus one ion, they'll say, are paramagnetic or diamagnetic. A paramagnetic means affected by the external magnetic field, okay? So how do we do that? Let's write copper. So copper is Cu. The next thing I want you to do is write the electron configuration or the partial electron configuration of copper. So when we look at copper, we say, well, argons, the noble gas before, and then we've got 4s2 electrons, but with copper, right, it's 4s2, 3d9, so that 9 is almost 10, so what's it going to do? It's going to promote that electron today. Everybody's okay with that, right? So now let's write the partial orbital diagram for this. Okay, so if you want to, you can help me out, but you don't, that's cool, too, but tell me if this is correct. So if we were looking at the, so this is for copper, right, let's look at the copper plus one ion. Let's talk about this one really quick. Will this be affected by a magnetic field? Yeah. Yeah, right? Why? One unpaired electron. One unpaired electron, right? So we say this is para-magnetic. Now let's look at the copper plus one ion. So where is that electron going to be removed from, bless you, before s, right? So no electron there. So does this have any unpaired electrons? No. So would it be affected by a nice turn on magnetic field? No. So we call this diamagnetic. So I hope this emphasizes what we're talking about here. Is everybody okay with what's going on? Got unpaired? You're going to be para-magnetic? You don't? Diamagnetic. Okay? Any questions on this stuff? Is that only work for the... Works for anything with an unpaired electron? So if, for example, I said, does sodium have unpaired electrons? Yeah. Yeah, one. So is it para-magnetic or diamagnetic? Para-magnetic. Okay? Is it cool with that? Yep. Okay.