Meitnerium (Mt) - Discovery, Occurrence, Production, Properties and Applications of Meitnerium

Chemical Formula



Meitnerium was first discovered by Gottfried Münzenber and Peter Armbruster at Heavy Ion Research Laboratory in Darmstadt, Germany in 1982. They bombarded bismuth-209 atoms with iron-58 ions in a linear accelerator and produced meitnerium-266 atoms with free neutrons. The element was named after the physicist Lise Meitner, one of the pioneers of nuclear fission.

Basic Information

Name Meitnerium
Symbol Mt
Atomic number 109
Atomic weight 276 amu
Standard state Presumably a solid at 298 K
CAS Registry ID 54038-01-6
Group in periodic table 9
Period in periodic table 7
Block in periodic table d-block
Color Unknown, but probably metallic and silvery white or grey in appearance
Classification Metallic
Melting point Unknown
Boiling point Unknown
Density Unknown
Phase at room temperature Solid


Meitnerium does not occur naturally.

Meitnerium - Periodic Table of Videos


Meitnerium has been found to have seven isotopes with mass numbers in the range of 266Mt to 278Mt. It has no stable or naturally- occurring isotopes. However, 266Mt is the longest-lived isotope with a half-life of 8 s.


Meitnerium atoms can be produced through a nuclear reaction that involves a cold fusion of a bismuth isotope with iron ions.

         209Bi + 58Fe → 266Mt + 1n

Very few quantities of meitnerium have been produced so far owing to the fact that the element decays rapidly via alpha emission.

Key Properties

The following are the key properties of meitnerium:

  • It is a radioactive metal
  • It is very unstable in air
  • It is expected to have properties similar to that of other group 9 elements, iridium, cobalt and rhodium in particular.


The applications of meitnerium are currently limited to scientific research only.


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G.P. Thomas

Written by

G.P. Thomas

Gary graduated from the University of Manchester with a first-class honours degree in Geochemistry and a Masters in Earth Sciences. After working in the Australian mining industry, Gary decided to hang up his geology boots and turn his hand to writing. When he isn't developing topical and informative content, Gary can usually be found playing his beloved guitar, or watching Aston Villa FC snatch defeat from the jaws of victory.


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