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. |