Atomic Properties
- Atomic Number
- 100
- Atomic Mass
- 257.0000 u
- Electron Configuration
- [Rn] 5f12 7s2
- Electronegativity
- 1.30
- Block
- f-block
- Group
- —
- Period
- 7
Physical Properties
- Phase (STP)
- solid
- Melting Point
- 1800.00 K
- Boiling Point
- —
- Density
- 9.7000 g/cm³
About Fermium
Named after Enrico Fermi; discovered in hydrogen bomb debris.
Isotopes of Fermium
Fermium has 0 naturally occurring isotopes, plus 1 notable radioactive isotope.
| Isotope | Mass Number | Atomic Mass (u) | Abundance | Type |
|---|---|---|---|---|
| 257Fm | 257 | 257.0951061 | — | Radioactive |
Data source: NIH PubChem (aggregated from IUPAC, NIST)