column in the Uf the same charge change in radius as you move the s Group 1A downa Group 2A Group 3A Group 6A Group 7A Li+ 0.90 Be2+ 0.59 B3+ 0.41 Li 1.34 0.90 0.82 Na 1.16 Mg2+ 0.86 Al3+ 0.68 Na 1.54 Mg 1.30 1.18 Cl 1.02 Ca2+ 1.14 Ga3+ 0.76 1.52 1.84 1.82 1.96 1.24 1.26 1.16 1.14 Rbt 1.66 1.32 0.94 1.33 Rb 2.11 Sr 1.92 In 1.44 neutral atom RE Z.7 Cation and anion size. Radi, in angstroms of atos and in r move down a com s anion for five cation â² FIGURE 7.7er groups of representative elements charge ionic radius increases as we li es the principal quantum number of the of the ion increases