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Technical data for Cobalt

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Overview
NameCobalt
SymbolCo
Atomic Number27
Atomic Weight58.9332
Density8.9 g/cm3
Melting Point1495 °C
Boiling Point2927 °C

Thermal properties
PhaseSolid
Melting Point1495 °C
Boiling Point2927 °C
Absolute Melting Point1768 K
Absolute Boiling Point3.2×103 K
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion16.2 kJ/mol
Heat of Vaporization375 kJ/mol
Heat of CombustionN/A
Specific Heat421 J/(kg K)[note]
Adiabatic IndexN/A
Neel PointN/A
Thermal Conductivity100 W/(m K)
Thermal Expansion0.000013 K-1

Bulk physical properties
Density8.9 g/cm3
Density (Liquid)7.75 g/cm3
Molar Volume6.62×10-6
Brinell Hardness700 MPa
Mohs Hardness5 MPa
Vickers Hardness1043 MPa
Bulk Modulus180 GPa
Shear Modulus75 GPa
Young Modulus209 GPa
Poisson Ratio0.31
Refractive IndexN/A
Speed of Sound4720 m/s
Thermal Conductivity100 W/(m K)
Thermal Expansion0.000013 K-1

Reactivity
Valence4
Electronegativity1.88
ElectronAffinity63.7 kJ/mol
Ionization Energies
760.4, 1648, 3232, 4950, 7670, 9840, 12440, 15230, 17959, 26570, 2.94×104, 3.24×104, 3.66×104, 3.97×104, 4.28×104, 49396, 52737, 134810, 145170, 1.547×105, 1.674×105 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A
Heat of CombustionN/A
DOT Hazard Class4.1
DOT Numbers3089
EU NumberN/A
NFPA Fire RatingN/A
NFPA HazardsN/A
NFPA Health RatingN/A
NFPA Reactivity RatingN/A
RTECS NumberRTECSGF8750000
NFPA LabelN/A

Classifications
Alternate NamesNone
Names of AllotropesNone
Blockd
Group9
Period4
Electron Configuration[Ar]3d74s2
ColorGray
Discovery
1735 in Sweden
Gas phaseN/A
CAS NumberCAS7440-48-4
CID NumberCID104730
Gmelin NumberN/A
NSC NumberN/A
RTECS NumberRTECSGF8750000

Electrical properties
Electrical TypeConductor
Electrical Conductivity1.7×107 S/m
Resistivity6×10-8 m Ω
Superconducting PointN/A

Magnetic properties
Magnetic TypeFerromagnetic
Curie Point1394 K
Mass Magnetic SusceptibilityN/A
Molar Magnetic SusceptibilityN/A
Volume Magnetic SusceptibilityN/A

Abundances
% in Universe0.0003%
% in Sun0.0004%
% in Meteorites0.059%
% in Earth's Crust0.003%
% in Oceans8×10-9%
% in Humans2×10-6%

Atomic dimensions and structure
Atomic Radius152 pm
Covalent Radius126 pm
Van der Waals RadiusN/A
Crystal StructureSimple Hexagonal
Lattice Angles
π/2, π/2, 2 π/3
Lattice Constants
250.71, 250.71, 406.95 pm
Space Group NameP63/mmc
Space Group Number194

Nuclear Properties
Half-LifeStable
LifetimeStable
Decay ModeN/A
Quantum Numbers4F9/2
Neutron Cross Section37.2
Neutron Mass Absorption0.021
Known Isotopes
47Co, 48Co, 49Co, 50Co, 51Co, 52Co, 53Co, 54Co, 55Co, 56Co, 57Co, 58Co, 59Co, 60Co, 61Co, 62Co, 63Co, 64Co, 65Co, 66Co, 67Co, 68Co, 69Co, 70Co, 71Co, 72Co, 73Co, 74Co, 75Co
Stable Isotopes
59Co
Isotopic Abundances
59Co100%


Notes on the properties of Cobalt:

Specific Heat: Value given for solid phase.

Up to date, curated data provided by
Mathematica's ElementData function from Wolfram Research, Inc.

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