 Okay, so we're just going to go over a couple of things, so Mg2 plus and Na plus. So are these two things isoelectronic? How do we figure it out? Yes. Yes, they are. How will we figure it out? Should be the number of electrons. The right electron configuration, okay? So let's do that. Let's do the electron configuration for Mg2 plus. S2 to S2. Can we do the shorthand? Yes, let's do the shorthand too. That's going to be the next step, okay? But let's do this one first, okay? What would this be? S2 to S2. So are these the exact same electron configuration? Yes. So, Iso, let's condense the electron configuration here. So you could just write that if it said condense electron configuration. In fact, that's what you would. What's the condense electron configuration here? Same. Yeah. So again, you can figure it out that way. Everybody cool with that? Yes. Do we need to do another one of these? Yes. Okay.