Berkelium

Kemiallinen merkki: Bk
Järjestysluku: 97
Kategoria: aktinoidit
Ryhmä: n/a
Jakso: 7
Lohko: f
Moolimassa: (247) g/mol
Elektronia kuorilla: 2, 8, 18, 32, 27, 8, 2
CAS-numero: 7440-40-6
Olomuoto: kiinteä
Tiheys: 14,78 kg/l (alpha) (lähellä huoneenlämpöä) 13,25 kg/l (beta) (lähellä huoneenlämpöä)
Sulamispiste: (beta) 1259 K (986 °C, 1807 °F)
Kiehumispiste: unknown
Kiderakenne: hexagonal close-packed
Hapetusluvut: 3, 4
Elektronegatiivisuus: 1,3 (Pauling-asteikko)
Nimen alkuperä: Berkeley
Nimen tarkoitus: a research group in University of California, Berkeley discovered the element
Faktoja:
- a radioactive metal
- was first synthesized by bombarding americium with alpha particles (helium ions)
- was the fifth transuranic element to be synthesized
- is a silvery metal that would easily oxidize in air at elevated temperatures and would be soluble in dilute mineral acids
- 19 radioisotopes of berkelium have been characterized, with the most stable being berkelium-247 with a half-life of
- like other aktinidit, berkelium bio-accumulates in skeletal tissue
- has no known uses outside of basic research
- plays no biological role