Europium

Kemiallinen merkki: Eu
Järjestysluku: 63
Kategoria: lantanoidit
Ryhmä: n/a
Jakso: 6
Lohko: f
Moolimassa: 151,964 g/mol
Elektronia kuorilla: 2, 8, 18, 25, 8, 2
CAS-numero: 7440-12-2
Olomuoto: kiinteä
Tiheys: 5,264 kg/l (lähellä huoneenlämpöä)
Sulamispiste: 1099 K (826 °C, 1519 °F)
Kiehumispiste: 1802 K (1529 °C, 2784 °F)
Kiderakenne: simple cubic (body centered)
Hapetusluvut: 3, 2
Elektronegatiivisuus: 1,2 (Pauling-asteikko)
Nimen alkuperä: Europe
Nimen tarkoitus: the continent
Faktoja:
- is the most reactive of the rare earth elements; it rapidly oxidizes in air, and resembles calcium in its reaction with water
- ignites in air at about 150 °C to 180 °C
- is about as hard as lead and quite ductile
- is a metal and becomes a superconductor under pressure 80 GPa at temperature 1,8 K
- has been used to dope some types of glass to make lasers, as well as for screening for Down syndrome and some other genetic diseases
- due to its amazing ability to absorb neutrons, it is also being studied for use in nuclear reactors
- europium oxide (Eu2O3) is widely used as a red phosphor in television sets and fluorescent lamps, and as an activator for yttrium-based
- is never found in nature as a free element; however, there are many minerals containing europium, with the most important sources being bastnäsite and monazite
- the metal dust presents a fire and explosion hazard
- has no known biological function