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caesium

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caesium


  3  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Caesium  \C[ae]"si*um\,  n.  [NL.,  from  L.  caesius  bluish  gray.] 
  (Chem.) 
  A  rare  alkaline  metal  found  in  mineral  water;  --  so  called 
  from  the  two  characteristic  blue  lines  in  its  spectrum.  It 
  was  the  first  element  discovered  by  spectrum  analysis,  and  is 
  the  most  strongly  basic  and  electro-positive  substance  known 
  Symbol  Cs  Atomic  weight  132.6. 
 
  From  WordNet  r  1.6  [wn]: 
 
  caesium 
  n  :  a  soft  silver-white  ductile  metallic  element  (liquid  at 
  normal  temperatures);  the  most  electropositive  and 
  alkaline  metal  [syn:  {cesium},  {Cs},  {atomic  number  55}] 
 
  From  Elements  database  20001107  [elements]: 
 
  caesium 
  Symbol:  Cs 
  Atomic  number:  55 
  Atomic  weight:  132.90545 
  Soft  silvery-white  metallic  element  belonging  to  group  1  of  the  periodic 
  table.  One  of  the  three  metals  which  are  liquid  at  room  temperature.  Cs-133 
  is  the  natural,  and  only  stable,  isotope.  Fifteen  other  radioisotopes  exist. 
  Caesium  reacts  explosively  with  cold  water,  and  ice  at  temperatures  above 
  157K.  Caesium  hydroxide  is  the  strongest  base  known  Caesium  is  the  most 
  electropositive,  most  alkaline  and  has  the  least  ionization  potential  of 
  all  the  elements.  Known  uses  include  the  basis  of  atomic  clocks,  catalyst 
  for  the  hydrogenation  of  some  organic  compounds,  and  in  photoelectric  cells. 
  Caesium  was  discovered  by  Gustav  Kirchoff  and  Robert  Bunsen  in  Germany  in 
  1860  spectroscopically.  Its  identification  was  based  upon  the  bright  blue 
  lines  in  its  spectrum.  The  name  comes  from  the  latin  word  caesius,  which 
  means  sky  blue.  Caesium  should  be  considered  highly  toxic.  Some  of  the 
  radioisotopes  are  even  more  toxic. 
 
 




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