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Element Fact
In 1961, the International Union of Pure and Applied Chemistry adopted the isotope carbon-12 as the basis of atomic weight, which has a mass of exactly 12.000 atomic mass unit.

Meitnerium, Mt

meitnerium sample

Atomic number: 109
Atomic mass: [268] (no stable nuclide)
Natural abundance: -
Isotopes: -

History and Production

Named after Lise Meitner (1878-1968), a physicist and mathematician. It was first identified in 1992 by P. Armbruster and G. Münzenberg from Darmstadt, Germany, by bombarding 209Bi with energetic 58Fe. The production can be achieved only in atomistic quantities. A week of bombardment may only produce a single atom of Element 109. In 1994, scientists at Dubna, Russia used a much higher irradiation dose and found the existence of 266Mt. The name meitnerium was adopted by IUPAC in 1997.

Physical Data

Only a few atoms have been produce and thus its physical properties cannot be determined.

Interatomic distance: -
Melting point: n/a
Boiling point: n/a
Thermal conductivity/Wm-1K-1: n/a
Density/kgm-3: n/a

Standard Thermodynamic Data (atomic gas)

Enthalpy of formation: -
Gibbs free energy of formation: -
Entropy: -
Heat capacity: -

Electronic data

Electronic configuration: Electronic configuration: [Rn] 5f14 6d7 7s2
Term symbol: 4F9/2
Electron affinity: -   Electronegativity (Pauline): -
Ionization energy (first, second, third): -, -, - kJ/mol

Chemical properties


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