Atomic Properties of Fm
- Atomic Number of Fm
- 100
- Atomic Mass of Fm
- 257.0000 u
- Electron Configuration
- [Rn] 5f12 7s2
- Electronegativity
- 1.30
- Block
- f-block
- Group
- —
- Period
- 7
Fermium (Fm) is element 100 on the periodic table. Atomic mass of Fm: 257.0000 u. Fm is in period 7. Melting point of Fm: 1800.00 K.Density of Fm: 9.70 g/cm³.
Fermium in everyday life and industry
No biological role. Too rare and short-lived for biological studies.
Discovered by Argonne, Los Alamos, U of Calif in United States, 1953
Name origin: Named in honor of the scientist Enrico Fermi.
Radioactive metallic transuranic element, belongs to the actinoids. Ten known isotopes, most stable is Fm-257 with a half-life of 10 days. First identified by Albert Ghiorso and associates in the debris of the first hydrogen-bomb explosion in 1952.
Fermium has 0 naturally occurring isotopes, plus 1 notable radioactive isotope.
| Isotope | Atomic Mass (u) | Abundance | Half-Life | Decay Mode |
|---|---|---|---|---|
| 257100Fm (Fm-257)Fermium-257 isotope | 257.0951061 | — | — | — |
Data source: NIH PubChem (aggregated from IUPAC, NIST)
It has no significant commercial applications.
Produced by bombarding lighter transuranium elements with still lighter particles or by neutron capture.
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