Европий

 

Atomic number     63

Atomic mass     151,96

Density, kg / m ?   5260

Temperature

melting, ° С       826

 

Europium - silvery-white metal, easily oxidized in air. The first spectral lines, later attributed to europium, were observed by Crookes (1886) and Lecoq de Boisbaudran (1892). Demarcay discovered a band of the element's spectrum in samarium earth in 1896, and in 1901 he was able to isolate the element, described it and named it after Europe.