Which Lewis dot diagram shows an atom that needs 2 more electrons in its outermost shell? A B C D Four choices. Choice A Hydrogen, H, dot on the right. Choice B, carbon, with 1 dot right, one dot bottom, one dot left, one dot top. Choice C, Oxygen. Two dots right, one dot bottom, two dots left, one dot top. Choice F, Fluorine. Two dots right, one dot bottom, two dots left, two dots top.