Refer to Figure 9-11 and explain why the difference between the ionic radii of the -1 and -2 anions does not remain constant from top to bottom of the periodic table.

Figure 9-11

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Li 155 Li+ Be²+ 59 Na Mg 190 160 102 K 235 Be 112 Na Mg 138 27 Rb 2+ 152 K+ Ca²+ Sc³+ Ti ²+ 72 Ca Sc Ti 197 162 147 100 Sr 248 215 Rb Sr²+ 2+ 118 75 86 134 V V2+ 128 64 ២ Cr2+ 79 73 V3+ Cr³+ 62 Mn2+ 126 Fe Mn 127 Fe²+ Co²+ 83 61 Fe³+ 125 55 € 65 € 124 55 128 77 Co³+ Ni2+ Cu2+ Zn²+ 69 Cu+ 73 Ag 144 115 75 B 84 95 Al 143 Zn Ga 134 140 A1³+ 54 62 75 Ga³+ Ge²+ 80 144 Cd In Sn 151 158 163 Ag Cd2+ In³+ Sn 2+ 73 ZO Si P 114 109 93 N 71 N3 171 120 Sb³+ CO 76 3 64 S 0² 140 133 104 $2 184 Se 118 2- Se² Sb Te 166 137 198 Te² F 221 60 100 CI 181 Br 117 Br 196 136 I 220