Elements / 100
100Fm[257]
Fermium
Actinide · f-block · ring Q
Fermium is element 100, an actinide. It is one of the actinides, which the spiral keeps in line on ring Q instead of exiling them to a strip below the table.
Properties
| Density | Not measured | Terrain → |
|---|---|---|
| Melting point | Not measured | Terrain → |
| Boiling point | Not measured | Terrain → |
| Electronegativity | 1.30 | Terrain → |
| First ionization energy | 627 kJ/mol | Terrain → |
| Atomic weight | 257 u | Terrain → |
| Crustal abundance | Not measured | Terrain → |
| Discovered | 1953 | Terrain → |
Values from open reference data; see sources. "Terrain" opens that property as a 3D landscape across the whole spiral.
Two things you might not know
- Pure metal of it has never been prepared, and one of its isotopes fissions on its own with a half-life of 370 microseconds.
- Named after Enrico, a pioneer of nuclear physics. Found in 1952 hydrogen bomb debris; heaviest made by neutron bombardment.
Checked against en.wikipedia.org.
Actinides
- Ac Actinium
- Th Thorium
- Pa Protactinium
- U Uranium
- Np Neptunium
- Pu Plutonium
- Am Americium
- Cm Curium
- Bk Berkelium
- Cf Californium
- Es Einsteinium
- Fm Fermium
- Md Mendelevium
- No Nobelium
Ring Q (period 7)
Play with Fermium
Watch it fly into its seat, or raise the whole spiral into a landscape and see where it peaks.