From: helbig@asclothestro.multivax.de   
      
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   In article ,   
   Michael Cole  writes:   
      
   > What exactly is it about the Cesium 133 atom that makes it so   
   > convenient for keeping time?  I assume they considered other atoms, but   
   > settled on Cesium as most convenient.  Is there a good simple reason for   
   > this?   
      
   A combination of several pracrical reasons.  See   
      
      https://physics.stackexchange.com/questions/191871/why-do-ato   
   ic-clocks-only-use-caesium/191876   
      
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