Hi all. I'm a student trying to learn some chemistry concepts on my own. So, i'll asking for some help a bit here. Look forward to hairing from yall too. To the question.. I don't understand why the radius of an atom gets larger as u move to the left of the periodic table. Since atoms have move electrons as you move to the right, i'm thinking, that the radius should also increase in that direction too. Move electrons, larger radius--but this isn't the case. How come?