27Co
Cobalt
Transition MetalCobalt (Co) is element 27, a transition metal, in period 4 and group 9 of the periodic table. Its standard atomic weight is 58.933, it melts at 1495 °C and boils at 2927 °C. Discovered by Georg Brandt, 1735.
Atomic Number27
SymbolCo
NameCobalt
Atomic Weight58.933 u
CategoryTransition Metal
Period4
Group9
Melting Point1495 °C
Boiling Point2927 °C
Density8.86 g/cm³
Electron Config[Ar] 3d7 4s2
Discovered ByGeorg Brandt, 1735