(So named (German kobold, literally "goblin", term used for the ore by miners, who regarded it as worthless and injurious because of its arsenic content) circa 1730 by Georg Brandt, Swedish chemist) A hard, lustrous, steel-gray, ductile, metallic chemical element, found in various ores. It is used in the preparation of magnetic, wear-resistant, and high-strength alloys. It's compounds are used in the production of inks, paints, and varnishes

Symbol: Co
Atomic number: 27
Atomic weight: 58.933200
Density (at room temperature and pressure): 8.9 g/cc
Melting point: 1,495°C
Boiling point: 2,927°C
Valence: +2, +3
Ground state electron configuration: [Ar]3d74s2

See also: cobalt-60