Cobalt (chemical element)

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Cobalt [g ǔ], element symbol Co, silver white ferromagnetic metal, silver white with light pink on the surface, is located in the fourth cycle and the eighth group in the periodic table, atomic number 27, atomic weight 58.9332, dense hexagonal crystal, the common valence is + 2, + 3. Cobalt is a lustrous steel gray metal, which is hard and brittle, ferromagnetic. When heated to 1150 ℃, the magnetism disappears. The valence of cobalt is + 2 and + 3. It is not affected by water at normal temperature and is stable in humid air. When heated to over 300 ℃ in air, COO is oxidized to form coo, which is burned to Co3O4 in white heat. The fine metal cobalt powder produced by hydrogen reduction can spontaneously generate cobalt oxide in air. Cobalt is an important raw material for the production of heat-resistant alloy, hard alloy, anticorrosive alloy, magnetic alloy and various cobalt salts.

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