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francium

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francium


  2  definitions  found 
 
  From  WordNet  r  1.6  [wn]: 
 
  francium 
  n  :  a  radioactive  element  of  the  alkali-metal  group  discovered 
  as  a  disintegration  product  of  actinium  [syn:  {Fr},  {atomic 
  number  87}] 
 
  From  Elements  database  20001107  [elements]: 
 
  francium 
  Symbol:  Fr 
  Atomic  number:  87 
  Atomic  weight:  (223) 
  Radioactive  element,  belongs  to  group  1  of  the  periodic  table.  Found  in 
  uranium  and  thorium  ores.  The  22  known  isotopes  are  all  radioactive,  with 
  the  most  stable  being  Fr-223.  Its  existence  was  confirmed  in  1939  by 
  Marguerite  Perey. 
 
 




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