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
Frequently asked questions
What is Meitnerium?
Meitnerium (Mt) is an unknown / predicted, element number 109 on the periodic table. Named after Lise Meitner.
What is the atomic number and atomic mass of Meitnerium?
Meitnerium has atomic number 109 and an atomic mass of about 278 g/mol.
What is the electron configuration of Meitnerium?
The electron configuration of Meitnerium is [Rn] 5f¹⁴ 6d⁷ 7s².
Where is Meitnerium on the periodic table?
Meitnerium sits in group 9, period 7, and is classified as a unknown / predicted.