Cobalt is a chemical element; it has symbol Co and atomic number 27. As with nickel, cobalt is found in the Earth's crust only in a chemically combined form, save for small deposits found in alloys of natural meteoric iron. … See more

Co is the only stable cobalt isotope and the only isotope that exists naturally on Earth. Twenty-two radioisotopes have been characterized: the most stable, Co, has a half-life of 5.2714 years; Co has a half-life of 271.8 days; Co has a half-life of 77.27 days; and Co … See more

Cobalt compounds have been used for centuries to impart a rich blue color to glass, glazes, and ceramics. Cobalt has been detected in Egyptian sculpture, Persian jewelry from … See more

Cobalt is a ferromagnetic metal with a specific gravity of 8.9. The Curie temperature is 1,115 °C (2,039 °F) and the magnetic moment is … See more

Common oxidation states of cobalt include +2 and +3, although compounds with oxidation states ranging from −3 to +5 are also known. A … See more

Many different stories about the origin of the word "cobalt" have been proposed. In one version the element cobalt was named after "kobelt", … See more

The stable form of cobalt is produced in supernovae through the r-process. It comprises 0.0029% of the Earth's crust. Except as recently delivered in meteoric iron, free cobalt (the See more