Chromium

Symbol | Cr
Latin name | Chromium
Atomic number | 24
Period | 4
Element category | Transition elements
Relative atomic mass | 51.9961
Group | VI.B
Electronegativity | 1.6
Oxidation numbers | 2, 3, 4, 5, 6
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d5 4s1
Density [g/cm3] | 7.19
State | Solid
Melting point [°C] | 1857
Boiling point [°C] | 2672
Atomic radius [pm] | 166
Covalent radius [pm] | 127
Thermal conductivity [W m-1K-1] | 93.7
Heat capacity [J K-1g-1] | 0.449
Discovery | 1797
Hardness [Mohs scale] | 9.0
Vickers hardness [MPa] | 1060
Brinell hardness [MPa] | 1120
Young's modulus [GPa] | 279
Electrical conductivity [S m-1] | 7.9 · 106
Shear modulus [GPa] | 115
1.st ionization energy [eV] | 6.7666
2.nd ionization energy [eV] | 16.5
3.rd ionization energy [eV] | 30.96
Stable isotopes | 4
Unstable isotopes | 5