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protoactiniummore about protoactinium

protoactinium


  1  definition  found 
 
  From  WordNet  r  1.6  [wn]: 
 
  protoactinium 
  n  :  a  short-lived  radioactive  metallic  element  formed  from 
  uranium  and  disintegrating  into  actinium  and  then  into 
  lead  [syn:  {protactinium},  {Pa},  {atomic  number  91}] 




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