Fermium
Fermium is a synthetic element with the symbol Fm and atomic number 100. A highly radioactive metallic transuranic element of the actinide series, fermium is made by bombarding plutonium with neutrons and is the eighth transuranic element.
| General | |
|---|---|
| Name, Symbol, Number | fermium, Fm, 100 |
| Chemical series | actinides |
| Group, Period, Block | n/a, 7, f |
| Appearance | unknown, probably silvery white or metallic gray |
| Standard atomic weight | (257) g·mol-1 |
| Electrons per shell | 2, 8, 18, 32, 30, 8, 2 |
| Physical properties | |
| Phase | solid |
| Melting point | 1800K (1527°C, 2781°F) |
| Atomic properties | |
| Oxidation states | 2, 3 |
| Electronegativity | 1.3 (Pauling scale) |
| Ionization energies | 1st: 627 kJ/mol |
| Miscellaneous | |
| CAS registry number | 7440-72-4 |
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