|
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]5f14 6d10 7s1 |
e- 's per energy level | 2, 8, 18, 32, 32, 18, 1 |
State of matter | Presumably a solid |
Unununium is a
chemical element in the
periodic table that has the symbol Uuu and
atomic number 111. It has an atomic weight of 272 making it one of the
super-heavy atoms[?]. It is a
synthetic element whose only known
isotope has a
half-life of around
15 ms before it decays into
meitnerium. Due to its presence in Group 11 it is a
transition metal and so probably metallic and solid.
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.