Now, let's look at the comic structure of Beryllium. This guy has one extra electron or one more electron than lithium. Now, that means that it also just like lithium has two electrons on the one s in it orbital. But now, because it has an extra electron, it has two electrons in the outermost two s orbital. So the ratio in lithium of inner electrons to outer electrons is two to one, while the ratio of inner to outer electrons in Beryllium is two to two. So the ratio is greater in this guy.