Temporary name of the chemical element with atomic number 109. It was first synthesized (one atom!) and identified in 1982 by P. Armbruster, G. M�nzenberg and colleagues at the Gesellshaft f�r Schwerionenforschung at Darmstadt, Germany¹.  The name meitnerium (symbol, Mt) was proposed, honoring the physicist Lise Meitner, co-discoverer of nuclear fission, and accepted in 1997 by the IUPAC's Commission on Nomenclature of Inorganic Chemistry.²

1. P. Armbruster.
Proceedings of the International Conference on Nuclear Physics, pages 343–363, Florence, 1983.

G. M�nzenberg et al.
Evidence for element 109 from one correlated decay sequence following the fusion of 58Fe with 209Bi.
Zeitung Phys A315, pages 145–158 (1984).

2. Inorganic Chemistry Division; Commission on Nomenclature of Inorganic Chemistry.
Names and Symbols of Transfermium Elements (IUPAC recommendation 1997)
Pure and Applied Chemistry, vol. 69, no. 12, pages 2471-2473 (1997).

Available on the Web as a pdf file accessible through www.iupac.org/projects/1995/220_30_95.html

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