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scandium (Sc)


scandium
Scandium.
Image copyright: smart-elements.com
A silvery-white, metallic rare earth element and transition element found in group IIIB of the periodic table. Scandium is widely distributed in low concentrations, and is extracted from thortveitite or as a by-product of uranium extraction.

Scandium forms trivalent ionic compounds and stable ligand complexes. 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.


atomic number 21
relative atomic mass 44.956
relative density 2.989
melting point 1,541°C (2,806°F)
boiling point 2,836°C (5,137°F)


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