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© May 2005 Lorentz JÄNTSCHI && Sorana Daniela BOLBOACĂ

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 D01 Inorganic Chemicals D007287 +
  D01.268 Elements D004602 +
   D01.268.185 Chalcogens D018011 +
     D01.268.185.550 Oxygen D010100 
     D01.268.185.600 Polonium D011059 
     D01.268.185.850 Selenium D012643 
     D01.268.185.900 Sulfur D013455 
     D01.268.185.950 Tellurium D013691