Erbium

Kemiallinen merkki: Er
Järjestysluku: 68
Kategoria: lantanoidit
Ryhmä: n/a
Jakso: 6
Lohko: f
Moolimassa: 167,259 g/mol
Elektronia kuorilla: 2, 8, 18, 30, 8, 2
CAS-numero: 7440-52-0
Olomuoto: kiinteä
Tiheys: 9,066 kg/l (lähellä huoneenlämpöä)
Sulamispiste: 1802 K (1529 °C, 2784 °F)
Kiehumispiste: 3141 K (2868 °C, 5194 °F)
Kiderakenne: hexagonal
Hapetusluvut: 3
Elektronegatiivisuus: 1,24 (Pauling-asteikko)
Nimen alkuperä: Ytterby
Nimen tarkoitus: the village where the element was found
Faktoja:
- is a rare, silvery, white metallic lanthanide which is solid in its normal state
- is malleable (or easily shaped), soft yet stable in air, and does not oxidize as quickly as some other rare-earth metals
- its salts are rose-colored, and the element has characteristic sharp absorption spectra bands in visible light, ultraviolet, and near infrared
- does not play any known biological role, but is thought by some to be able to stimulate metabol
- is commonly used as a photographic filter, and because of its resilience it is useful as a metallurgical additive
- its estimated abundance in the Earth's crust is 1,3 mg/kg
- plays no biological role in humans but may be able to stimulate
- the mineral gadolinite was spearated into three fractions which was called yttria, erbia, and terbia - erbia and terbia, however, were confused at this time, and after 1860, terbia was renamed erbia and after 1877 what had been known as erbi
- is never found as a free element in nature but is found bound in monazite sand ores
- has historically been very difficult and expensive to separate rare earths from each other in their ores but ion-exchange production techniques developed in the late 20th century have greatly brought down the cost of production of all rare-earth metals and their chemical compounds
- metallic erbium in dust form presents a fire and explosion hazard