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Eu - Europium

Europium

 Europium 
Eu
Atomic Number: 63
Atomic Weight: 151.965
Element Type: Rare Earth Metal
Crystal Structure: Cubic Body Centered
Melting Point: 822.0°C = 1511.6°F = 1095.15 K
Boiling Point: 1596.0°C = 2904.8°F = 1869.15 K
Critical Temp: °C = °F = K
Atomic Radius: 2.56 Å (Å = Angstrom = 10-10 m)
Covalent Radius: 1.85 Å
Electronegativity:

History

(Europe) In 1890 Boisbaudran obtained basic fractions from samarium-gadoliniumconcentrates which had spark spectral lines not accounted for by samarium or gadolinium.These lines subsequently have been shown to belong to europium. The discovery of europiumis generally credited to Demarcay, who separated the rare earth in reasonably pure form in1901. The pure metal was not isolated until recent years.


Sources

Europium has been identified spectroscopically in the sun and certain stars. Seventeenisotopes are now recognized. Europium isotopes are good neutron absorbers and are beingstudied for use in nuclear control applications.







Science Quote

'There must be no barriers for freedom of inquiry. There is no place for dogma in science. The scientist is free, and must be free to ask any question, to doubt any assertion, to seek for any evidence, to correct any errors.'

J. Robert Oppenheimer
(1904-1966)





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