Meitnerium
unknown, probably transition metal · period 7 · group 9 · d-block
Meitnerium is a synthetic chemical element with the symbol Mt and atomic number 109. It is an extremely radioactive synthetic element (an element not found in nature, but can be created in a laboratory).
What the numbers say
At standard temperature and pressure Meitnerium is a solid, sitting in period 7, group 9 of the d-block.
First identified in 1982.
Check it against computed structures
The structure search queries the Materials Project, OQMD and the Open Materials Database for computed crystal structures containing Mt — with DFT formation energy, hull stability and band gap where the provider publishes them.
K 2 · L 8 · M 18 · N 32 · O 32 · P 15 · Q 2
Properties
| Atomic number | 109 |
|---|---|
| Atomic mass | 278 u |
| Series | unknown, probably transition metal |
| Group | 9 |
| Period | 7 |
| Block | d-block |
| Phase at STP | Solid |
| Electron configuration | *[Rn] 5f¹⁴ 6d⁷ 7s² |
| Discovered | 1982 |
← Back to the periodic table
See Mt in context with all 118 elements.
Working with meitnerium in a real design?
Ask the materials chat how Mt behaves in your alloy system, what it does to weldability, and which grades to look at — with the source of every number named.