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Physical and chemical characteristics
Latin name Cobaltum (Co)
Group in Mendeleev's periodic table VII
Atomic number 27
Atomic weight 58.9332
Description Silver-white metal with a reddish shade.
Density 8.90 g/cm3
Melting point t 1,494 °С
Chemical activity At usual temperature on air chemically racks.

The name of the metal is derived from the German word Kobold meaning “goblin”. Compounds of cobalt were known and were applied from the remotest antiquity. The discovered Egyptian glass jug that is painted using cobalt salts and blue vitreous bricks containing cobalt are dated to the XV century BC. In ancient Assyria, and also in Babylon cobalt was used to create a lazurite glaze for stoneware.