Fm
Fermium
FERMIUM
TRANSITION ELEMENT: ACTINIDE
| Atomic number: | 100 |
| Group numbers: | 3 |
| Period: | 7 |
| Electronic configuration: | [Rn] 5f12 7s2 |
| Formal oxidation number: | +3 |
| Electronegativities: | - |
| Atomic radius / pm: | - |
| Relative atomic mass: | - |
Fermium was discovered by Albert Ghiorso & Berkely Lab. (US) in 1953. Named in honour of Enrico Fermi. It is a synthetic radioactive metal. Fermium was produced by bombarding lighter transuranium elements with still lighter particles or by neutron capture.
| Density / g dm-3: | - | |
| Molar volume / cm3mol-1: | - | |
| Electrical resistivity / µΩcm: | - | (20 °C) |
| Thermal conductivity / W m-1K-1: | - |
| Melting point / °C: | 1527 |
| Boiling point / °C: | - |
| Heat of fusion / kJ mol-1: | - |
| Heat of vaporization / kJ mol-1: | - |
| Heat of atomization / kJ mol-1: | 141 |
| First ionization energy / kJ mol-1: | 627.16 |
| Second ionization energy / kJ mol-1: | - |
| Third ionization energy / kJ mol-1: | - |
| in the atmosphere / ppm: | - |
| in the Earth's crust / ppm: | - |
| in the oceans / ppm: | - |
| Crystal structure: | unknown structure |
| Unit-cell dimensions / pm: | - |
| Space group: | - |
| Isotope | Relative atomic mass | Mass percent (%) |
|---|---|---|
| 253Fm | 253.085 19(3) | * |
| 257Fm | 257.095 11(5) | * |
| Balanced half-reaction | Eo / V | |
|---|---|---|
| 99 Einsteinium | ← | 100 Fermium | → | 101 Mendelevium |
Citing this page:
Generalic, Eni. "Fermium." EniG. Periodic Table of the Elements. KTF-Split, 13 Feb. 2025. Web. {Date of access}. <https://www.periodni.com/fm.html>.
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