Chemical Element: unununium

(Modern Latin: a temporary IUPAC [International Union of Pure and Applied Chemistry] nomenclature; radioactive metal)

Chemical-Element Information

Symbol: Uuu
Atomic number: 111
Year discovered: 1994

Discovered by: Sigurd Hofmann, Victor Ninov, F. P. Hessberger, P. Armbruster, H. Folger, G. Münzenberg, H. J. Schött, and others; at Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany.


  • Element 111 was discovered towards the end of 1994 one month after the discovery of element 110 at the GSI in Darmstadt, Germany.
  • Three atoms of an isotope 272 Uuu were produced in reactions between 209 Bi targets and 64 Ni projectiles.
  • To achieve this, the nickel atoms were accelerated to high energies by the heavy ion accelerator UNILAC at GSI and directed onto a lead target.
  • Chemically, element 111 should be in the same group as the elements copper, silver, and gold (Group 11).
  • See ununnilium (Uub), Atomic Number 112, for further data.

Name in other languages:

French: ununnilium

German: Ununnilium

Italian: ununnilio

Spanish: ununnilio


Information about other elements may be seen at this Chemical Elements List.

A special unit about words that include chemo-, chem- may be seen here.