Transition metal

Chromium

Chromium (Cr) has atomic number 24. PubChem classifies it as transition metal.

Atomic number

24

Symbol

Cr

Atomic weight (source value)

51.996

Electron configuration

[Ar]3d5 4s1

Standard state

Solid

Electronegativity (Pauling)

1.66

Melting point (K)

2180

Boiling point (K)

2944

Density (g/cm³)

7.15

Oxidation states

+6, +3, +2

Understanding this entry

Atomic number is the number of protons in the nucleus. Properties are reference values and may depend on conditions and measurement conventions. An atomic weight is not the mass of every isotope. For elements without a standard atomic weight, a source may report an isotope mass number. Blank source values are shown as unavailable rather than estimated.

Further reading and reference: NIH PubChem source dataset ↗. Values and educational summaries are not a substitute for specialised advice.