109Unknown
Mt 276 Atomic mass · uTransition metals
Meitnerium
Meitnerium is a chemical element with symbol Mt and atomic number 109. It is an extremely radioactive synthetic element (an element not found in nature that can be created in a laboratory). The most stable known isotope, meitnerium-278, has a half-life of 7.6 seconds.
Discovery 1982 (Gesellschaft für Schwerionenforschung)
K2L8M18N32O32P15Q2
Physical properties
Values for the element in its standard state.
- Density
- Not available
- Melting point
- Not available
- Boiling point
- Not available
- Atomic radius
- Not available
- Bonding type
- Not recorded
- Molar heat
- Not available
Inside the atom
Electron arrangement and the energy behind its behavior.
Full electron configuration
1s, 2 electrons; 2s, 2 electrons; 2p, 6 electrons; 3s, 2 electrons; 3p, 6 electrons; 3d, 10 electrons; 4s, 2 electrons; 4p, 6 electrons; 4d, 10 electrons; 5s, 2 electrons; 5p, 6 electrons; 4f, 14 electrons; 5d, 10 electrons; 6s, 2 electrons; 6p, 6 electrons; 5f, 14 electrons; 6d, 7 electrons; 7s, 2 electrons;
[Rn] represents 86 core electrons. The full view shows them explicitly.
109 electrons Orbital order preserved from source
- Electronegativity
- Not availablePauling scale
- First ionization energy
- Not available
- Electron affinity
- Not available
- Van der Waals radius
- Not available
Mt MeitneriumAtomic number 109
UnknownkJ/mol
Atomic numberGaps indicate unavailable data
About meitnerium
- Appearance
- Not recorded
- Discovery
- 1982 (Gesellschaft für Schwerionenforschung)
- Data source
- Read the reference
A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.