Chromium (Cr) — Element 24: Properties & Data | Aladdin Scientific
Chromium(Cr) — Element 24
Chromium (Cr) is a transition metal with atomic number 24 and atomic mass 51.996. It has melting point 2180 K (1907 °C), boiling point 2944 K (2671 °C), density 7.15 g/cm³. It sits in group 6 and period 4 of the periodic table and was discovered in 1797.
Key facts
| Atomic mass | 51.9960 u |
|---|---|
| Electron configuration | [Ar]3d5 4s1 |
| Oxidation states | +6, +3, +2 |
| Electronegativity (Pauling) | 1.66 |
| Atomic radius (van der Waals) | 189 pm |
| Ionization energy | 6.767 eV |
| Electron affinity | 0.666 eV |
| Melting point | 2180 K |
| Boiling point | 2944 K |
| Density | 7.15 g/cm³ |
| Standard state | Solid |
| Year discovered | 1797 |
Frequently asked questions
What is the electron configuration of chromium?
The ground-state electron configuration of chromium is [Ar]3d5 4s1.
What group and period is chromium in?
Chromium (Cr) is in group 6 and period 4 of the periodic table, classified as a transition metal.
What is the melting point of chromium?
Chromium melts at 2180 K (1907 °C).
What is the standard state of chromium?
Chromium is a solid at standard temperature and pressure.
Related elements
About this data: property values compiled from IUPAC Standard Atomic Weights (2021), the NIST Atomic Spectra Database, and PubChem. Curated by the Aladdin Scientific technical team. Last reviewed: .