The atomic radius of atoms increases in groups of elements on the Periodic Table of the Elements. The graph shows Group 1 elements and their atomic radii.Which best describes what tends to occur in groups that results in an increase in atomic radius?A. The elements transition from gases to liquids to solids.B. The attraction between the nucleus and electrons decreases.C. The size of the nucleus increases, forcing electrons outward.D. The repulsion between electrons outside the nucleus decreases.