Discovered By: Nicolas-Louis Vauquelin
Discovery year: 1780

The following table showing some properties of Chromium(Cr):

Table Example
Atomic number 24
Group 6
Period 4
Block d
Electrons 24
Protons 24
Neutrons 28
Atomic weight 51.9961
Oxidation states -2, +2, +3, +4, +6
Ionic charge Cr^3+, Cr^2+


Table Example
Electrons per shell K2 L8 M13 N1
Electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1 3d^5
Atomic radius 166 pm
Covalent radius 139 pm
Boiling point 2671°C
Melting point 1907°C
Neel point 393 K
Phase Solid
Fusion heat 20.5 kJ.mol^-1
Thermal expansion 4.9*10^-6 K^-1


Table Example
Vaporization heat 339 kJ.mol^-1
Color Silver
Brinell hardness 1120 MPa
Bulk modulus 160 GPa
Density 7190 kg.m^-3
Liquid density 6300 kg.m^-3
Mohs hardness 8.5
Poisson ratio 0.21
Shear modulus 115 GPa
Sound speed 5940 m.s^-1


Table Example
Vickers hardness 1060 MPa
Young's modulus 279 GPa
Electrical type Conductor
Magnetic type Antiferromagnetic
Volume magnetic susceptibility 3.177*10^-4
Resistivity 1.3*10^-7 Ohm.m
Electronegativity 1.66
Valence 6
Radioactive No
Neutron cross section 3.1 barn