WebElements

Periodic Table

unununium

Atomic number: 111
Atomic weight: 272
Symbol: Uuu
Group number: 11
Electronic configuration: [Rn].5f14.6d10.7s1 (a guess based upon that of gold)

Description

Element 111 was discovered towards theend of 1994 at the GSI in Darmstadt, Germany. Further information on element 111 is here (outside WebElements). The information following is an abstract of this source. The interested reader should consult the on-line version of The Wonderful World of Atoms and Nuclei (outside WebElements) for a fascinating insight into research on "super-heavy" atoms.

Chemically, element 111 should be in the same group as the elements copper, silver, and gold (Group 11).

General information

Discoveror: S. Hofmann, V. Ninov, F. P. Hessberger, P. Armbruster, H. Folger, G. Münzenberg, and others
Date discovered: 1994
Discovered at: Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany.
Meaning of name: Temporary IUPAC nomenclature

Physical data

Standard state: unknown but presumably a solid at 298 K
Colour: y

Isotopes

This section gives some data for naturally occurring isotopes.
Nominal mass Accurate mass % natural abundance
nil

Further Information

Copyright 1997 Mark Winter
Department of Chemistry at the University of Sheffield, Sheffield S3 7HF, England.

The current version of this document is at http://www.shef.ac.uk/~chem/web-elements-I/Uuu.html