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einsteinium

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einsteinium


  2  definitions  found 
 
  From  WordNet  r  1.6  [wn]: 
 
  einsteinium 
  n  :  a  radioactive  transuranic  element  produced  by  bombarding 
  plutonium  with  neutrons  [syn:  {Es},  {E},  {atomic  number 
  99}] 
 
  From  Elements  database  20001107  [elements]: 
 
  einsteinium 
  Symbol:  Es 
  Atomic  number:  99 
  Atomic  weight:  (254) 
  Appearance  is  unknown,  however  it  is  most  probably  metallic  and  silver 
  or  gray  in  color.  Radioactive  metallic  transuranic  element  belonging  to  the 
  actinoids  Es-254  has  the  longest  half-life  of  the  eleven  known  isotopes  at 
  270  days.  First  identified  by  Albert  Ghiorso  and  associates  in  the  debris  of 
  the  1952  hydrogen  bomb  explosion.  In  1961  the  first  microgram  quantities  of 
  Es-232  were  separated.  While  einsteinium  never  exists  naturally,  if  a 
  sufficient  amount  was  assembled,  it  would  pose  a  radiation  hazard. 
 
 




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