Periodic Table of the Elements

ununnilium	Atomic number: 110 Atomic weight: 269 Symbol: Uun Group number: 10 Electronic configuration: [Rn].5f¹⁴.6d⁹.7s¹ (a guess based upon that of platinum)
Description General information Physical data Radii Electronegativities Solid state structure Temperatures Enthalpies Ionization Enthalpies Isotopes Further information

Description

Element 110, ununnilium, is a synthetic element that is not present in the environment at all. Further information on element 110 is here (outside WebElements) and in a press release (outside WebElements). The interested reader should consult the on-line version of The Wonderful World of Atoms and Nuclei for a fascinating insight into research on "super-heavy" atoms.
Chemically, the element 110 is in the same Group as nickel, palladium, and platinum (Group 10). Unlike these lighter atoms, element 110 decays after a small fraction of a thousandth of a second into lighter elements by emitting a-particles which are the nuclei of helium atoms.

General information

Discoveror: S. Hofmann, V. Ninov, F. P. Hessberger, P. Armbruster, H. Folger, G. Münzenberg, H. J. Schött, 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: py

Isotopes

This section gives some data for naturally occurring isotopes.

Nominal mass Accurate mass % natural abundance

nil

Nominal mass	Accurate mass	% natural abundance
		nil

Further Information

Additional information about WebElements 1.2.2
This is a licensed copy (here is the full list) of WebElements 1.2.2 and contains a subset of the material contained within the main version of WebElements (version 2)
For further information please try WebElements version 2
Sheffield Chemdex: perhaps the largest internet chemistry directory
Sheffield Chemputer: interactive chemistry calculators on the WWW

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/Uun.html