Latin nameChromium
English nameChromium
chemical symbolCr
atomic number24
relative atomic mass51,9961
classificationtransition metals
discovery year1797
discovererL. N. Vauquelin
melting point [°C]1857
boiling point [°C]2672
density [g cm-3]7,19
density at melting point [g cm-3]6,3
electronegativity [Pauling]1,66
oxidation statesI - VI
electron configuration[Ar]3d5 4s1
atomic radius [pm]166
covalent radius [pm]127
specific heat [J g-1K-1]0,45
heat of fusion [kJ mol-1]16,9
thermal conductivity [W m-1 K-1]93,9
el. conductivity [S m-1]7,9.106
1. ionizing potential [eV]6,7666
2. ionizing potential [eV]16,5
3. ionizing potential [eV]30,96
Mohs hardness8,5
Vickers hardness [MPa]1060
Brinell hardness [MPa]1120
shear modulus [GPa]115
Young's modulus [GPa]279
point of superconductivity [K] -
state at normal conditionssolid