From: dietz@dls.net   
      
   Ian Stirling wrote:   
      
   > Xenon is an atom, oxygen and nitrogen are molecules, though they (IIRC)   
   > have a total atomic weight about the same as xenon.   
      
   Not even close.   
      
   Molecular weights:   
      
   O2: ~32   
   N2: ~28   
   Xe (atmospheric): 131.30   
      
   	Paul   
      
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