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radonmore about radon

radon


  2  definitions  found 
 
  From  WordNet  r  1.6  [wn]: 
 
  radon 
  n  :  a  radioactive  gaseous  element  formed  by  the  disintegration 
  of  radium;  the  heaviest  of  the  inert  gasses;  occurs 
  naturally  (especially  in  areas  over  granite)  and  is 
  considered  a  hazard  to  health  [syn:  {Rn},  {atomic  number 
  86}] 
 
  From  Elements  database  20001107  [elements]: 
 
  radon 
  Symbol:  Rn 
  Atomic  number:  86 
  Atomic  weight:  (222) 
  Colorless  radioactive  gaseous  element,  belongs  to  the  noble  gases.  Of  the 
  twenty  known  isotopes,  the  most  stable  is  Rn-222  with  a  half-life  of  3.8  days. 
  Formed  by  the  radioactive  decay  of  {Radium}-226.  Radon  itself  decays  into 
  {polonium}.  Used  in  radiotherapy.  As  a  noble  gas,  it  is  effectively  inert, 
  though  radon  fluoride  has  been  synthesized.  First  isolated  in  1908  by  Ramsey 
  and  Gray. 
 
 




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