Fermium
Fermium (镄, symbol Fm) is chemical element number 100, an Actinide in period 7 of the periodic table, with a standard atomic weight of about 257. Heaviest actinide that can be created by neutron capture. Named for Enrico Fermi.
Properties
| Atomic number | 100 |
|---|---|
| Symbol | Fm |
| Atomic mass | 257 u |
| Category | Actinide |
| Period | 7 |
| Group | — |
| Electron configuration | [Rn] 5f¹² 7s² |
| Electronegativity | 1.3 |
| Covalent radius | — |
| Density | 9.7 g/cm³ |
| Melting point | 1800 K |
| Boiling point | — |
| Discovery | Ghiorso et al., 1952 |
Overview
Heaviest actinide that can be created by neutron capture. Named for Enrico Fermi. Fermium (symbol Fm) is chemical element number 100, sitting in period 7 of the periodic table and classed as an Actinide. As an actinide it is typically radioactive and closely tied to nuclear technology.
With 2 electrons in its outermost shell, Fermium bonds accordingly; full configuration [Rn] 5f¹² 7s², electronegativity 1.3. At room temperature it is normally a solid; it melts near 1800 K (1526.9 °C), has a density around 9.7 g/cm³.
Common applications range across Research. It is regarded as a high-hazard element, so handle it with appropriate care. It was first described by Ghiorso et al. in 1952. Browse elements of the same category in the browse view.
Electron shells
Electrons per shell: 2 · 8 · 18 · 32 · 30 · 8 · 2
Main uses
- Research
Hazard
Compounds containing Fermium
No compounds in this knowledge base contain Fermium yet.
Data sources
Atomic mass uses IUPAC (CIAAW) standard atomic weights; the covalent radius is from Cordero et al. (2008). Verify on the RSC Periodic Table, PubChem and Wikipedia. Educational reference only.