Koboltti

Kemiallinen merkki: Co
Järjestysluku: 27
Kategoria: siirtymämetallit
Ryhmä: 9
Jakso: 4
Lohko: d
Moolimassa: 58,9332 g/mol
Elektronia kuorilla: 2, 8, 15, 2
CAS-numero: 7440-48-4
Olomuoto: kiinteä
Tiheys: 8,90 kg/l (lähellä huoneenlämpöä)
Sulamispiste: 1768 K (1495 °C, 2723 °F)
Kiehumispiste: 3200 K (2927 °C, 5301 °F)
Kiderakenne: hexagonal
Hapetusluvut: 4, 3, 2, 1
Elektronegatiivisuus: 1,88 (Pauling-asteikko)
Nimen alkuperä: kobold
Nimen tarkoitus: goblin: a term used for the ore of cobalt by miners
Faktoja:
- is a hard, lustrous, grey metal
- is found in various metallic-lustred ores for example cobaltite, but it is produced as a by- product of copper and nickel mining
- is at higher levels of exposure mutagenic and carcinogenic
- is an essential trace-element for all multicellular organisms as the active center of coenzymes called cobalamins
- is mostly used in superalloys for e,g, jet engines, and is also used in batteries (lithium cobalt oxide is used in Li-ion batteries), catalysts, pigments and electroplating