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 DIRECTORY/Science/Tech/Chemistry/Elements/Roentgenium (3)
i0Apsidium: Roentgenium - http://www.apsidium.com/elements/111.htm - Basic information and atomic structure.
 
i0IUPAC: Roentgenium - http://www.iupac.org/news/archives/2004/naming111.html - A note about confirmation of synthesis of the element 111.
 
i0Wikipedia: Roentgenium - http://en.wikipedia.org/wiki/Roentgenium - Basic physical and historical information.
 
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