238 

 234 

 230 

 226 

 222 

 218 

 214 



210 

 206 



235 



231 



227 

 223 



219 



215 



211 



207 



Atomic Numbers 

 and symbols 

 89 90 91 92 



Tl Pb Bi Po 



Rn 



Ra 



Ac 



Th Pa 



U 



ACTINIUM FAMILY 



AcU 



ACD (Pb207) 

 81 82 83 84 



85 86 87 88 89 90 



91 92 



232 

 228 

 224 

 220 

 216 

 212 



208 



Alpha- ray 

 or Helium 



nucleus 

 expelled 



Beta - ray 

 or electron 



expelled 



91 92 



