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Cobalt is a chemical element with Co as its symbol. It belongs to group 9, periodic number 4 of the periodic table. Its atomic number is 27.
Cobalt is silver-white in color with a bluish tinge. It is a hard, ferromagnetic, brittle element. The primary ores of cobalt are cobaltite, smaltite and erythrite. It can also be obtained as a byproduct of lead, nickel, silver, copper and iron mining and refining processes. Evidence also indicates that it is present in meteorites. Major cobalt producers are DR Congo, Zambia, China, Russia and Australia.
Cobalt is stable in air and is not affected by water. It is active chemically and dissolves in dilute sulfuric acid, nitric or hydrochloric acid. Alkalis have an effect on it as well.