And if the force is stronger, so the protons are pulling our outermost electrons with a greater force, that means our radius will decrease. The difference between the center, the nucleus and the outermost electron will decrease as we go across the period. So that means our lithium will have the highest radius, the largest radius, and the smallest effective nuclear charge, while our fluoride will have the highest effective nuclear charge and the smallest atomic radius. So now let's talk about a group. What happens as we go from top of the group to the bottom of the group? So let's look at the following group.