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Apsidium: Roentgenium
http://www.apsidium.com/elements/111.htm
Basic information and atomic structure.
IUPAC: Roentgenium
http://www.iupac.org/news/archives/2004/naming111.html
A note about confirmation of synthesis of the element 111.
Wikipedia: Roentgenium
http://en.wikipedia.org/wiki/Roentgenium
Basic physical and historical information.