 So let's try this one now. It's kind of like the last only good place to follow in an increasing order, but this time it's by atomic size. So you want to recall, when you look at the periodic table, that going down groups or families, the atoms get bigger. And going across the period from left to right, they get bigger. I mean smaller, smaller, sorry. They also get smaller. So the biggest ones are in the bottom left corner. And the smallest ones are out there in the top right corner. So when we're looking at these three here, Sulfur, Argon, and Potassium, we kind of want to compare those. They're fairly close together, so they're kind of more straightforward to compare. So we said that they get bigger when you go from the right to the left than the periodic table, right? So which one's going to be bigger? Argon or Sulfur? Sulfur's going to be bigger than Argon. So we know that already. Sulfur or Argon is smaller than Sulfur. And now we look over here. So what's bigger? Sulfur or Sodium? Sodium's going to be much bigger. Is Potassium bigger than Sodium? Yes. So then it must be bigger than Sulfur and Argon, right? Does that make sense? So the biggest of these must be Potassium, okay? So it's got to go like that. Does that make sense?