 So again, this is a very similar problem to the one that we just did, the one that we just finished. This will be the last one we did before lunch. This one is similar but different because we're looking at the relative size of three particles except the three particles are essentially ions and parent atom of the same atom, right? So instead of looking at relative on the periodic table, we're trying to compare these forms of ion. So if you recall our discussion about the nucleus having an influence on the electron cloud, so it has more of an influence when the number of electrons is less than the number of protons because there's going to be a stronger pull inwards towards the nucleus, right? Then if you recall that, you often should also recall that cations, which these are, are going to have or be smaller than their parent. In that case, we know both of these are going to be smaller than this. So that's the biggest. So how do we determine which one is bigger here? Well it's the same principle. The nuclear charge three plus because it has one less electron than empty two plus. So in this case empty three plus.