Lanthanum

ETYM New Lat., from Greek lanthanein to lie hid, to be concealed.
Soft, silvery, ductile and malleable, metallic element, symbol La, atomic number 57, atomic weight 138.91, the first of the lanthanide series. It is used in making alloys. It was named 1839 by Swedish chemist Carl Mosander (1797–1858).
A white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth; SYN. La, atomic number 57. + prikaži više