Cobalt |
Symbol | Co |
---|---|
Latin name | Cobaltum |
Atomic number | 27 |
Period | 4 |
Element category | Transition elements |
Relative atomic mass | 58.93320 |
Group | VIII.B |
Electronegativity | 1.8 |
Oxidation numbers | 2, 3 |
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d7 4s2 |
Density [g/cm3] | 8.9 |
State | Solid |
Melting point [°C] | 1494 |
Boiling point [°C] | 2900 |
Atomic radius [pm] | 152 |
Covalent radius [pm] | 126 |
Thermal conductivity [W m-1K-1] | 100 |
Heat capacity [J K-1g-1] | 0.421 |
Discovery | 1735 |
Hardness [Mohs scale] | 5.5 |
Vickers hardness [MPa] | 1043 |
Brinell hardness [MPa] | 700 |
Young's modulus [GPa] | 209 |
Electrical conductivity [S m-1] | 1.7 · 107 |
Shear modulus [GPa] | 75 |
1.st ionization energy [eV] | 7.881 |
2.nd ionization energy [eV] | 17.06 |
3.rd ionization energy [eV] | 33.5 |
Stable isotopes | 1 |
Unstable isotopes | 13 |