| Overview |
| Name | Cobalt |
| Symbol | Co |
| Atomic Number | 27 |
| Atomic Weight | 58.9332 |
| Density | 8.9 g/cm3 |
| Melting Point | 1495 °C |
| Boiling Point | 2927 °C |
Thermal properties |
| Phase | Solid |
| Melting Point | 1495 °C |
| Boiling Point | 2927 °C |
| Absolute Melting Point | 1768 K |
| Absolute Boiling Point | 3.2×103 K |
| Heat of Fusion | 16.2 kJ/mol |
| Heat of Vaporization | 375 kJ/mol |
| Heat of Combustion | N/A |
| Specific Heat | 421 J/(kg K)[note] |
| Thermal Conductivity | 100 W/(m K) |
| Thermal Expansion | 0.000013 K-1 |
Bulk physical properties |
| Density | 8.9 g/cm3 |
| Density (Liquid) | 7.75 g/cm3 |
| Molar Volume | 6.62×10-6 |
| Brinell Hardness | 700 MPa |
| Mohs Hardness | 5 MPa |
| Vickers Hardness | 1043 MPa |
| Bulk Modulus | 180 GPa |
| Shear Modulus | 75 GPa |
| Young Modulus | 209 GPa |
| Poisson Ratio | 0.31 |
| Speed of Sound | 4720 m/s |
| Thermal Conductivity | 100 W/(m K) |
| Thermal Expansion | 0.000013 K-1 |
Reactivity |
| Valence | 4 |
| Electronegativity | 1.88 |
| ElectronAffinity | 63.7 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 Point | N/A |
| Flashpoint | N/A |
|
Classifications |
| Alternate Names | None |
| Nams of Allotropes | None |
| Block | d |
| Group | 9 |
| Period | 4 |
| Electron Configuration | [Ar]3d74s2 |
| Color | Gray |
| Discovery | |
| Gas phase | N/A |
| CAS Number | CAS7440-48-4 |
Electrical properties |
| Electrical Type | Conductor |
| Electrical Conductivity | 1.7×107 S/m |
| Resistivity | 6×10-8 m Ω |
| Superconducting Point | N/A |
Magnetic properties |
| Magnetic Type | Ferromagnetic |
| Curie Point | 1394 K |
| Mass Magnetic Susceptibility | N/A |
| Molar Magnetic Susceptibility | N/A |
| Volume Magnetic Susceptibility | N/A |
Abundances |
| % in Universe | 0.0003% |
| % in Sun | 0.0004% |
| % in Meteorites | 0.059% |
| % in Earth's Crust | 0.003% |
| % in Oceans | 8×10-9% |
| % in Humans | 2×10-6% |
Atomic dimensions and structure |
| Atomic Radius | 152 pm |
| Covalent Radius | 126 pm |
| Van der Waals Radius | N/A |
| Crystal Structure | Simple Hexagonal |
| Lattice Angles | |
| Lattice Constants | | 250.71, 250.71, 406.95 pm |
|
| Space Group Name | P63/mmc |
| Space Group Number | 194 |
Nuclear Properties |
| Half-Life | Stable |
| Lifetime | Stable |
| Stable Isotopes | |
| Isotopic Abundances | |
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