Fermium

Kemiallinen merkki: Fm
Järjestysluku: 100
Kategoria: aktinoidit
Ryhmä: n/a
Jakso: 7
Lohko: f
Moolimassa: (257) g/mol
Elektronia kuorilla: 2, 8, 18, 32, 30, 8, 2
CAS-numero: 7440-72-4
Olomuoto: kiinteä
Tiheys: unknown
Sulamispiste: 1800 K (1527 °C, 2781 °F)
Kiehumispiste: unknown
Kiderakenne: unknown
Hapetusluvut: 2, 3
Elektronegatiivisuus: 1,3 (Pauling-asteikko)
Nimen alkuperä: Enrico Fermi
Nimen tarkoitus: in honor of the nuclear physicist
Faktoja:
- is a highly radioactive metallic transuranic element
- is made by bombarding plutonium with neutrons
- only small amounts of fermium have ever been produced or isolated - thus relatively little is known about its chemical properties
- there are no known uses of fermium outside of basic research
- does not occur naturally in any measurable quantities
- 17 radioisotopes of fermium have been characterized, with the most stable being fermium-257 with a half-life of 100,5 da
- fermium-255 was found in the debris of the first hydrogen bomb explosion