Chromium

Atomic number

24

Atomic mass (u)

51.996

Category

Transition metal

Standard state

Solid

Melting point

1906.85 °C (2180 K)

Boiling point

2670.85 °C (2944 K)

Density (g/cm³)

7.15

Electronegativity (Pauling)

1.66

Electron configuration

[Ar]3d5 4s1

Oxidation states

+6, +3, +2

Atomic radius (pm)

189

First ionization energy (eV)

6.767

Discovery & recognition

Discovery year / period (PubChem)

1797

Discovery credited to (RSC)

Nicholas Louis Vauquelin

Date or period recorded by RSC

1798

Discovery place

Paris, France

An ancient date does not identify a first human discovery. Different references may date observation, isolation and formal recognition differently.

Natural occurrence & production

The creation of an element’s nuclei and its concentration into terrestrial deposits are different processes. The occurrence note below concerns its presence or production on Earth; it is not a complete account of nucleosynthesis.

“Chromium is found mainly in chromite.”

Royal Society of Chemistry · occurrence excerpt ↗

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Reference values are not product specifications. Blank values have not been estimated. For superheavy elements, some properties and family assignments are theoretical or incompletely measured.