27
Cobalt
Atomic Number27
Atomic Mass58.933 u
CategoryTransition Metal
State at Room TempSolid
Year Discovered1735
About Cobalt
Named after kobold, a German goblin blamed for poisoning miners. Essential for vitamin B12. Used in lithium-ion battery cathodes, making it critical for electric vehicles. Cobalt blue pigment has been used since antiquity. The Democratic Republic of Congo produces about 70% of the worlds cobalt. Cobalt-60 is used in cancer radiotherapy and medical sterilization.
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