Nickel

Symbol | Ni
Latin name | Niccolum
Atomic number | 28
Period | 4
Element category | Transition elements
Relative atomic mass | 58.69
Group | VIII.B
Electronegativity | 1.8
Oxidation numbers | 2, 3
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d8 4s2
Density [g/cm3] | 8.908
State | Solid
Melting point [°C] | 1455
Boiling point [°C] | 2732
Thermal conductivity [W m-1K-1] | 90.7
Heat capacity [J K-1g-1] | 0.444
Discovery | 1751
Hardness [Mohs scale] | 4.0
Vickers hardness [MPa] | 638
Brinell hardness [MPa] | 700
Young's modulus [GPa] | 200
Electrical conductivity [S m-1] | 1.4 · 107
Shear modulus [GPa] | 76
1.st ionization energy [eV] | 7.6398
2.nd ionization energy [eV] | 18.168
3.rd ionization energy [eV] | 35.17
Stable isotopes | 5
Unstable isotopes | 7