El radio atómico se refiere al tamaño del átomo, en general tiende a en el mismo periodo, y abajo en el mismo grupo a familia., por ello, será en el francio que en el litio a) disminuir/aumentar/mayor b) disminuir/aumentar/menor c) aumentar/aumentar/mayor d) disminuir/disminuir/mayor

a) Disminuir/aumentar/mayor. In English, a) decrease/increase/larger

The atomic radius decreases from left to right in a period, because the added protons in the nucleus increase the attraction for the electrons. The electrons are on average closer to the nucleus, so the atomic radius decreases.

The atomic radius increases from top to bottom of a Group because you are adding electrons to the next energy level that is further from the nucleus.