Kalifornium

Kemiallinen merkki: Cf
Järjestysluku: 98
Kategoria: aktinoidit
Ryhmä: n/a
Jakso: 7
Lohko: f
Moolimassa: (251) g/mol
Elektronia kuorilla: 2, 8, 18, 32, 28, 8, 2
CAS-numero: 7440-71-3
Olomuoto: kiinteä
Tiheys: 15,1 kg/l (lähellä huoneenlämpöä)
Sulamispiste: 1173 K (900 °C, 1652 °F)
Kiehumispiste: 1743 K (1470 °C, 2678 °F)
Kiderakenne: hexagonal
Hapetusluvut: 2, 3, 4
Elektronegatiivisuus: 1,3 (Pauling-asteikko)
Nimen alkuperä: California
Nimen tarkoitus: a research group in University of California, Berkeley discovered the element and named it after the state
Faktoja:
- a radioactive transuranic element
- is used in starting nuclear reactors, optimizing coal-fired power plants and cement production facilities (via online analyzers), medical treatment of cancer, and oil exploration via down hole well loggin
- was first produced by bombarding curium with alpha particles (helium ions)
- twenty radioisotopes of californium have been characterized, the most stable being californium- 251 with a half-life of 898 years
- although californium does not occur naturally on Earth, the element and its decay products occur elsewhere in the universe
- has no biological role and only a few californium compounds have been made and studied
- is extremely radioactive and harmful