Gadolinium

Kemiallinen merkki: Gd
Järjestysluku: 64
Kategoria: lantanoidit
Ryhmä: n/a
Jakso: 6
Lohko: f
Moolimassa: 157,25 g/mol
Elektronia kuorilla: 2, 8, 18, 25, 9, 2
CAS-numero: 7440-54-2
Olomuoto: kiinteä
Tiheys: 7,90 kg/l (lähellä huoneenlämpöä)
Sulamispiste: 1585 K (1312 °C, 2394 °F)
Kiehumispiste: 3546 K (3273 °C, 5923 °F)
Kiderakenne: hexagonal
Hapetusluvut: 3
Elektronegatiivisuus: 1,20 (Pauling-asteikko)
Nimen alkuperä: Johan Gadolin
Nimen tarkoitus: the Finnish chemist and geologist
Faktoja:
- is a silvery-white, malleable and ductile rare- earth metal with a metallic lustre
- crystallizes in hexagonal, close-packed alpha form at room temperature, but, when heated to 1508 K or more, it transforms into its beta form, which has a b
- unlike other rare earth elements, gadolinium is relatively stable in dry air - however, it tarnishes quickly in moist air, forming a loosely-adhering oxide which spalls off, exposing more surface to oxidation
- is used for making gadolinium yttrium garnets, which have microwave applications, and gadolinium compounds are used for making phosphors for colour TV tubes
- is used in nuclear marine propulsion systems as a burnable poison
- has no known native biological role, but in research on biological systems it has a few roles - it is used as a component of MRI contrast agents
- is never found in nature as the free element, but is contained in many rare minerals such as\
- occurs only in trace amounts in the mineral gadolinite, which was also named after Johan Gadolin
- as with the other lantanidit, gadolinium compounds are of low to moderate toxicity, although their toxicity has not been investigated in
- in patients with renal failure or other pro- inflammatory conditions, there is data associating its use with development of nephrogenic fibrosing dermopathy as a side effect of gadolinium chelates used as a contrast agent for MRI examinat