Quick Facts
| Property | Value |
|---|---|
| Symbol | Fm |
| Atomic Number | 100 |
| Atomic Mass | [257] u |
| Category | Actinide |
| Period | 7 |
| Group | 3 |
| Block | f |
| Electron Configuration | [Rn] 5f¹² 7s² |
History and Discovery
Discovered by: Albert Ghiorso and colleagues Year of Discovery: 1952 Location: Debris from Ivy Mike hydrogen bomb test
Etymology
Named after Enrico Fermi, nuclear physics pioneer.
Interesting Facts
- Discovered alongside einsteinium in H-bomb debris
- Named after Enrico Fermi
- Last element that can be produced in macroscopic quantities
- Cannot be synthesized in reactors—only in explosions
- Heaviest element that can be made by neutron capture