Cobalt is a chemical element with symbol Co and atomic number 27. Like nickel, cobalt in the Earth's crust is found only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal.Symbol: Co
Atomic number: 27
Electron configuration: [Ar] 4s2 3d7
Melting point: 1,495 °C
Atomic mass: 58.933195 ± 0.000005 u
Discoverers: Georg Brandt