Symbol: Co

Atomic Number: 27

Atomic Weight: 58.993

Cobalt (symbol Co, number 27) is a chemical element occurring naturally only in a combined compound form. When isolated, it is a silver-gray, lustrous, hard metal. It is used quite effectively as a blue pigment and has been used this way since antiquity for jewelry and other decorative items, to give glass a blue tinge, and more. Eventually, it emerged that the metal bismuth had this function. This metal is also known as goblin ore (German) because of the blue color it produced and because it gives off poisonous fumes upon smelting. The new metal, to which these ores were...Read More