Infobox cobalt

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Template:Infobox element/2023 taskforce isobox reuse

Cobalt, 27Co
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PronunciationTemplate:Infobox element/pronunciation
AllotropesTemplate:Infobox element/symbol-to-allotropes
Appearancehard lustrous bluish gray metal
Mass numberTemplate:Infobox element/symbol-to-most-stable-isotope
Cobalt in the periodic table
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Atomic number (Z)27
GroupTemplate:Infobox element/symbol-to-group
PeriodTemplate:Infobox element/symbol-to-period
BlockTemplate:Infobox element/block format
Electron configurationTemplate:Infobox element/symbol-to-electron-configuration
Electrons per shell2, 8, 15, 2
Physical properties
Phase at STPTemplate:Infobox element/symbol-to-phase
Melting point1768 K ​(1495 °C, ​2723 °F)
Boiling point3200 K ​(2927 °C, ​5301 °F)
Density (near r.t.)8.90 g/cm3
when liquid (at m.p.)8.86 g/cm3
Heat of fusion16.06 kJ/mol
[[Enthalpy of vaporization|Heat of Template:Engvar]]377 kJ/mol
Molar heat capacity24.81 J/(mol·K)
[[Vapor pressure|Template:Engvar pressure]]
Atomic properties
Oxidation statesTemplate:Infobox element/symbol-to-oxidation-state
ElectronegativityPauling scale: 1.88
[[Ionization energy|Template:Engvar energies]]
  • 1st: 760.4 kJ/mol
  • 2nd: 1648 kJ/mol
  • 3rd: 3232 kJ/mol
  • (more)
Atomic radiusempirical: 125 pm
Covalent radiusLow spin: 126±3 pm
High spin: 150±7 pm
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Other properties
Natural occurrenceTemplate:Infobox element/symbol-to-occurrence
Crystal structureTemplate:Infobox element/crystal structure
Speed of sound thin rod4720 m/s (at 20 °C)
Thermal expansion13.0 µm/(m⋅K) (at 25 °C)
Thermal conductivity100 W/(m⋅K)
Electrical resistivity62.4 nΩ⋅m (at 20 °C)
Magnetic orderingferromagnetic
Young's modulus209 GPa
Shear modulus75 GPa
Bulk modulus180 GPa
Poisson ratio0.31
Mohs hardness5.0
Vickers hardness1043 MPa
Brinell hardness470–3000 MPa
CAS Number7440-48-4
Discovery and first isolationGeorg Brandt (1735)
SymbolTemplate:Infobox element/symbol-to-symbol-etymology
Main isotopes of cobalt
Template:infobox cobalt isotopes does not exist
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