| |||||
Known properties | |||||
---|---|---|---|---|---|
Name, Symbol, Number | Unununium, Uuu, 111 | ||||
Chemical series | Transition metals | ||||
Group, Period, Block | 11, 7 , d | ||||
Appearance | unknown; probably metallic, silvery white or gray | ||||
Atomic weight | [272] amu | ||||
Electron configuration | probably [Rn]55f14 6d10 7s1 | ||||
e- 's per energy level | 2, 8, 18, 32, 32, 18, 1 | ||||
State of matter | Presumably a solid |
History
It was first created at the Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany on December 8, 1994. Only three atoms of it have been created (all Uuu-272), by the fusion of bismuth-209 and nickel-64 in a linear accelerator (nickel was bombarded onto the target).
It is named Unununium, as in 1-1-1-ium, a temporary IUPAC systematic element name. There is an ongoing element naming controversy over what this element should be called.