rho·di·um /ˈrodiəm/
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  rho·di·um /ˈrodɪəm/ 名詞
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  Rho·di·um n.  Chem. A rare element of the light platinum group. It is found in platinum ores, and obtained free as a white inert metal which it is very difficult to fuse. Symbol Rh. Atomic weight 104.1.  Specific gravity 12.
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  rhodium
       n : a white hard metallic element that is one of the platinum
           group and is found in platinum ores; used in alloys with
           platinum [syn: Rh, atomic number 45]
  rhodium
  Symbol: Rh
  Atomic number: 45
  Atomic weight: 102.905
  Silvery white metallic transition element. Found with platinum and used in
  some platinum alloys. Not attacked by acids, dissolves only in aqua regia.
  Discovered in 1803 by W.H. Wollaston.