Template:Infobox cobalt

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27 ironcobaltnickel
-

Co

Rh
General
Name, symbol, number cobalt, Co, 27
Chemical series transition metals
Group, period, block 94, d
Appearance metallic with gray tinge
Standard atomic weight 58.933195(5)g·mol−1
Electron configuration [Ar] 4s2 3d7
Electrons per shell 2, 8, 15, 2
Color a grayish silver
Density (near r.t.) 8.90 g·cm−3
Liquid density at m.p. 7.75 g·cm−3
Melting point 1768 K
(1495 °C, 2723 °F)
Boiling point 3200 K
(2927 °C, 5301 °F)
Heat of fusion 16.06 kJ·mol−1
Heat of vaporization 377 kJ·mol−1
Specific heat capacity (25 °C) 24.81 J·mol−1·K−1
Vapor pressure
P/Pa 1 10 100 1 k 10 k 100 k
at T/K 1790 1960 2165 2423 2755 3198
Atomic properties
Crystal structure hexagonal
Oxidation states 4 [1], 3, 2, 1 [2]
(amphoteric oxide)
Electronegativity 1.88 (Pauling scale)
Ionization energies
(more)
1st: 760.4 kJ·mol−1
2nd: 1648 kJ·mol−1
3rd: 3232 kJ·mol−1
Atomic radius 135 pm
Atomic radius (calc.) 152 pm
Covalent radius 126 pm
Miscellaneous
Magnetic ordering ferromagnetic
Electrical resistivity (20 °C) 62.4 nΩ·m
Thermal conductivity (300 K) 100 W·m−1·K−1
Thermal expansion (25 °C) 13.0 µm·m−1·K−1
Speed of sound (thin rod) (20 °C) 4720 m/s
Young's modulus 209 GPa
Shear modulus 75 GPa
Bulk modulus 180 GPa
Poisson ratio 0.31
Mohs hardness 5.0
Vickers hardness 1043 MPa
Brinell hardness 700 MPa
CAS registry number 7440-48-4
Selected isotopes
Main article: Isotopes of cobalt
iso NA half-life DM DE (MeV) DP
56Co syn 77.27 d ε 4.566 56Fe
57Co syn 271.79 d ε 0.836 57Fe
58Co syn 70.86 d ε 2.307 58Fe
59Co 100% 59Co is stable with 32 neutrons
60Co syn 5.2714 years β- 2.824 60Ni
References
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