Roentgenium

Apsidium: Roentgenium
Basic information and atomic structure.
http://www.apsidium.com/elements/111.htm

IUPAC: Roentgenium
A note about confirmation of synthesis of the element 111.
http://www.iupac.org/news/archives/2004/naming111.html

Wikipedia: Roentgenium
Basic physical and historical information.
http://en.wikipedia.org/wiki/Roentgenium