109 Mt
Unknown / predicted
Meitnerium
Named after Lise Meitner.
Properties of Meitnerium
- Atomic number (Z)
- 109
- Symbol
- Mt
- Atomic mass
- 278 g/mol
- Category
- Unknown / predicted
- Group
- 9
- Period
- 7
- Electron configuration
- [Rn] 5f¹⁴ 6d⁷ 7s²
- Electronegativity (Pauling)
- —
- Atomic radius
- —
- First ionization energy
- 800 kJ/mol
- Melting point
- —
- Boiling point
- —
- Density
- 37.4 g/cm³
- Phase at 25 °C
- Solid
- Discovered
- Discovered in 1982