Meitnerium (Mt)
Meitnerium (Mt) is element 109. Atomic mass 278, configuration [Rn] 5f¹⁴ 6d⁷ 7s². Properties, isotopes, oxidation states, uses and history, with an interactive 3D atom model.
Key facts
| Atomic number | 109 |
|---|---|
| Symbol | Mt |
| Standard atomic weight | 278 |
| Group | 9 |
| Period | 7 |
| Electron configuration | [Rn] 5f¹⁴ 6d⁷ 7s² |
| Valence electrons | 2 (Variable) |
| Common oxidation states | +3 |
| Common ions | No common ions |
| First ionization energy | 800 kJ/mol |
Common uses
- Research only
Where it matters
- Women in Science (Meitner discovered fission but was overlooked for Nobel)
Hazards
- Radioactive
History
| Discovered | 1982 |
|---|---|
| Discovered by | GSI Helmholtz Centre (Germany) |
| Name | Lise Meitner |