208 84. Polonium 85. ————— (6) 197 to 204 206, 208 (various radio (various radio (various radio . elements) elements) elements) 86. Nt 222 87. 88. Ra 226 89. Ac 226 90. Th 232-15 91. 92. U 238-2 (Fh Em 220 (Th X 224 (Ms Th II 228) (various radio (various radio . elements) elements) elements) 86. Nt 222 87. 88. Ra 226 89.