A silvery-white, metallic rare
earth element and transition
element found in group IIIB of the periodic
table. It was predicted (as ekaboron) by Dmitri Mendeleyev
and discovered in 1879. Scandium is widely distributed in low concentrations,
and is extracted from thortveitite or as a by-product of uranium
Scandium forms trivalent ionic compounds
and stable ligand complexes. Chemically,
it resembles the lanthanide series. It
is used as a radioactive tracer and in nickel alkaline storage batteries.
The refractory scandium oxide (Sc2O3) is used in ceramics
and as a catalyst; dilute scandium sulfate
solution is used to improve germination
of plant seeds.
|relative atomic mass