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astatine

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astatine


  2  definitions  found 
 
  From  WordNet  r  1.6  [wn]: 
 
  astatine 
  n  :  a  highly  unstable  radioactive  element  (the  heaviest  of  the 
  halogen  series);  a  decay  product  of  uranium  and  thorium 
  [syn:  {At},  {atomic  number  85}] 
 
  From  Elements  database  20001107  [elements]: 
 
  astatine 
  Symbol:  At 
  Atomic  number:  85 
  Atomic  weight:  (210) 
  Radioactive  halogen  element.  Occurs  naturally  from  uranium  and  thorium 
  decay.  At  least  20  known  isotopes.  At-210,  the  most  stable,  has  a 
  half-life  of  8.3  hours.  Synthesized  by  nuclear  bombardment  in  1940  by  D.R. 
  Corson,  K.R.  MacKenzie  and  E.  Segre  at  the  University  of  California. 
 
 




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