Periodic Table


Atomic number: 109
Atomic weight: 266
Symbol: Mt
Group number: 9
Electronic configuration: [Rn].5f14.6d7.7s2 (a guess based upon that of iridium)


Element 109, meitnerium, is a synthetic element that is not present in the environment at all. There is no dispute concerning the name meitnerium for element 109.

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.

General information

Discoveror: Peter Armbruster, Gottfried Münzenber and their co-workers.
Date discovered: 1982
Discovered at: Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany.
Meaning of name: Named after Lise "Meitner", the Austrian physicist

Physical data

Standard state: unknown but presumably a solid at 298 K
Colour: /TR>


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

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/Mt.html