And now what happens is, since this still has three protons, but it now has two electrons, this develops a positive charge. While this Fluorine atom, which Had Nine protons, nine Electrons, now has nine protons, ten electrons. So it develops a negative charge. And let's recall what Coulomb's Law tells us. So, from physics, we know that Coulomb's law simply states that constant K times charge one times charge two divided by the distance between the center of charges squared, gives us the force due to a charge on another charge. So here we have one charge species a cation.