And therefore this molecule, this anion is more stable than the neutral counterpart. So this reaction going this way is exothermic. Now. That means whenever we go from Lithium to Beryllium to Boron and so on, whenever we go from left to right, our electron activity increases. And that means this guy, this reaction is more exothermic for fluorine than for lithium. In other words, whenever our fluorine gains electrons, it becomes stable and it loses a lot of energy.