109Mt277.154
Meitnerium
Transition Metal
Solid at STP
Period 7Group 9Block DDiscovered 1982
[Rn]7s2 5f14 6d7 (calculated)
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.
📖 Read more on Wikipedia →Atomic Properties
| Atomic Number | 109 |
| Atomic Mass | 277.154 u |
| Electron Configuration | [Rn]7s2 5f14 6d7 (calculated) |
| Oxidation States | 9, 8, 6, 4, 3, 1 |
| Block | D |
Physical Properties
| Standard State | Solid |
| CPK Color | #EB0026 |
Classification
| Category | Transition Metal |
| Group Block | Transition metal |
| Period | 7 |
| Group | 9 |
| Block | D |
Discovery
| Year Discovered | 1982 |
| Discovered By | Gesellschaft für Schwerionenforschung |
| Electron Shells | 2, 8, 18, 32, 32, 15, 2 |