Unununium

Darmstadtium - Unununium - Ununbium
Au Uuu
	Full table

Known properties

Name, Symbol, Number

Unununium, Uuu, 111

Chemical series

Transition metals

11, 7 , d

Appearance

unknown; probably metallic,
silvery white or gray

Atomic weight

Electron configuration

probably [Rn]55 f¹⁴ 6d¹⁰ 7s¹

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.

History

It was first created at the Gesellschaft f�r 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.