Meitnerium Element Facts

The chemical element meitnerium is classed as a transition metal. It was discovered in 1982 by by research scientists led by Peter Armbruster and Gottfried M├╝nzenber.

Meitnerium is named after Lise Meitner.
Lise Meitner and Otto Hahn

Meitnerium is named after Lise Meitner, who was part of the team of scientists that discovered nuclear fission. She is shown here in the laboratory with her colleague Otto Hahn.


Data Zone

Classification: Meitnerium is a transition metal
Atomic weight: (278), no stable isotopes
State: solid (presumed)
Melting point:
Boiling point:
Electrons: 109
Protons: 109
Neutrons in most abundant isotope: 169
Electron shells: 2,8,18,32,32,15,2
Electron configuration: [Rn] 5f14 6d7 7s2
Density @ 20oC:
Show more, including: Heats, Energies, Oxidation, Reactions, Compounds, Radii, Conductivities
Atomic volume:
Specific heat capacity
Heat of fusion
Heat of atomization
Heat of vaporization
1st ionization energy
2nd ionization energy
3rd ionization energy
Electron affinity
Minimum oxidation number
Min. common oxidation no.
Maximum oxidation number
Max. common oxidation no.
Electronegativity (Pauling Scale)
Polarizability volume
Reaction with air
Reaction with 15 M HNO3
Reaction with 6 M HCl
Reaction with 6 M NaOH
Atomic radius
Ionic radius (1+ ion)
Ionic radius (2+ ion)
Ionic radius (3+ ion)
Ionic radius (1- ion)
Ionic radius (2- ion)
Ionic radius (3- ion)
Thermal conductivity
Electrical conductivity
Freezing/Melting point:

Discovery of Meitnerium

Meitnerium was first synthesized by research scientists led by Peter Armbruster and Gottfried Münzenber at the Heavy Ion Research Laboratory in Darmstadt, Germany in 1982.

They bombarded bismuth-209 with accelerated iron-58 nuclei.

The element was named after physicist and mathematician Lise Meitner.

Appearance and Characteristics

Harmful effects:

Meitnerium is harmful due to its radioactivity.


Meitnerium is a synthetic, radioactive metal and has only been produced in tiny amounts.

Uses of Meitnerium

Meitnerium is of scientific research interest only.

Abundance and Isotopes

Abundance earth’s crust: nil

Abundance earth’s crust: nil

Abundance solar system: parts per billion by weight, parts per trillion by moles

Cost, pure: $ per 100g

Cost, bulk: $ per 100g

Source: Meitnerium is a synthetic radioactive metal, created via nuclear bombardment, and has only been produced in minute amounts. Meitnerium was produced by bombarding 209Bi with 58Fe which produced a single atom of the isotope 266Mt.

Isotopes: Meitnerium has 7 isotopes whose half-lives are known, with mass numbers from 266 to 278. None are stable. The most stable isotope is 278Mt, with a half-life of 8 seconds.

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