Meitnerium
Transition Metal
Meitnerium (Mt) is a chemical element with atomic number 109, classified as a transition metal. At room temperature it is a solid. It was discovered in 1982 by Gesellschaft für Schwerionenforschung (GSI).
Properties
- Atomic number
- 109
- Atomic mass
- 278 u
- Category
- Transition Metal
- Group
- 9
- Period
- 7
- Block
- d-block
- Electron configuration
- [Rn] 5f¹⁴ 6d⁷ 7s²
- Phase at STP
- Solid
- Density
- 37.4 g/cm³
- Melting point
- —
- Boiling point
- —
- Electronegativity
- —
- Atomic radius
- —
- Ionization energy
- —
- Discovery
- 1982 · Gesellschaft für Schwerionenforschung (GSI)
Common uses
Research only
Did you know?
Named after Lise Meitner, physicist who discovered nuclear fission.
Experiment with the elements
Meitnerium doesn't form any compounds in our lab yet, but the periodic table sandbox lets you combine dozens of other real elements into real compounds — water, table salt, ammonia and many more — with their true chemical formulas.