Roentgenium was discovered by S. Hofmann, V. Ninov, F. P. Hessberger, P. Armbruster, H. Folger, G. Münzenberg, and others at 1994 in Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany.. Origin of name: the proposed name roentgenium has yet ot be accepted formally, but lies within the long established tradition of naming elements to honour famous scientists. Wilhelm Conrad Roentgen discovered X-rays in 1895.
Atomic Number: 111
Atomic Weight: 281
Melting Point: Unknown
Boiling Point: Unknown
Density: Unknown
Phase at Room Temperature: Expected to be a Solid
Element Classification: Metal
Period Number: 7 Group Number: 11 Group Name: none