Stable isotope Chromium (Cr)

Isotope Z(p) N(n) Atomic Mass Natural Abundance Enrichment Level Chemical Form
Cr-50 24 26 49.946049 4.35% 96.50-99.70% Metal
Cr-50 24 26 49.946049 4.35% 94.50-99.70% Oxide
Cr-52 24 28 51.940512 83.79% ≥98.80% Metal
Cr-52 24 28 51.940512 83.79% ≥98.80% Oxide
Cr-53 24 29 52.940653 9.50% 92.80-97.70% Metal
Cr-53 24 29 52.940653 9.50% 92.80-97.70% Oxide
Cr-54 24 30 53.938885 2.36% >99.00% Metal
Cr-54 24 30 53.938885 2.36% >99.00% Oxide

Properties of Chromium

Name Chromium
Symbol Cr
Atomic number 24
Atomic weight 51.996
Standard state Solid at 298 °K
CAS Registry ID 7440-47-3
Group in periodic table 6
Group name None
Period in periodic table 4
Block in periodic table d-block
Color Silvery metallic
Classification Metallic
Melting point 1875 °C
Boiling point 2672 °C
Thermal conductivity 93.9 W/(m·K) at 298.2 °K
Electrical resistivity 12.9 µΩ·cm at 0 °C
Electronegativity 1.6
Specific heat 448 J/kg K
Heat of vaporization 339 kJ·mol-1
Heat of fusion 20.5 kJ·mol-1
Density of solid  7.14 g/cm3
Electron configuration [Ar]3d54s
Atomic radius 1.27 Å
Oxidation states -2, -1, +1, +2, +3, +4, +5, +6