Periodic table of the elements
IronCobaltNickel
27
Co
Cobalt
58.933195
2
8
15
2
27
Co
Cobalt
58.933195
2
8
15
2
General
NameCobalt
SymbolCo
Number27
Chemical seriesTransition elements
Group / Period9 / 4
Blockd-block
CAS registry number7440-48-4

Physical properties
Statesolid
Density8.90 g/cm3
Melting point1768 K (1495°C, 2723°F)
Boiling point3200 K (2927°C, 5301°F)
Critical point

Atomic properties
Atomic Weight58.933195 g/mol
Crystal structurehexagonal
Electronegativity1.88
Atomic radius135 pm
Atomic radius (calculated)152 pm
Electron configuration[Ar] 4s2 3d7
Electrons per shell2, 8, 15, 2
Number of protons27
Number of neutrons32

Other languages
SpanishCobalto
PortugueseCobalto
FrenchCobalt
GermanCobalt
ItalianCobalto
RussianКобальт
PolishKobalt
Chinese
Arabicكوبالت
TurkishKobalt
DutchKobalt


Periodic table of the elements
IronCobaltNickel