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© May 2005 Lorentz JÄNTSCHI && Sorana Daniela BOLBOACĂ

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 D01 Inorganic Chemicals D007287 +
  D01.268 Elements D004602 +
   D01.268.613 Noble Gases D005741 +
     D01.268.613.050 Argon D001128 
     D01.268.613.350 Helium D006371 
     D01.268.613.425 Krypton D007726 
     D01.268.613.600 Neon D009356 
     D01.268.613.700 Radon D011886 
     D01.268.613.900 Xenon D014978 


 D01 Inorganic Chemicals D007287 +
  D01.362 Gases D005740 +
   D01.362.641 Noble Gases D005741 +
     D01.362.641.113 Argon D001128 
     D01.362.641.352 Helium D006371 
     D01.362.641.468 Krypton D007726 
     D01.362.641.592 Neon D009356 
     D01.362.641.745 Radon D011886 
     D01.362.641.918 Xenon D014978