Cr
Chromium Symbol (Cr)
Chromium is element 24 of the periodic table. Copy its symbol Cr and see its atomic weight, electron configuration and common compounds.
What does Cr mean?
Cr is the chemical symbol for chromium, element number 24 in the periodic table. Chromium is a transition metal in group 6, period 4. It is the element that makes stainless steel resist corrosion and gives chrome plating its shine.
Codes and properties
| Chemical symbol | Cr |
|---|---|
| Atomic number (Z) | 24 |
| Atomic weight (PubChem) | 51.996 |
| Group / period | 6 / 4 |
| Element category | transition metal |
| Electron configuration | [Ar]3d⁵ 4s¹ |
| State at 20 °C | Solid |
| Oxidation states | +6, +3, +2 |
| Electronegativity (Pauling) | 1.66 |
| Melting point | 2180 K (1906.85 °C) |
| Boiling point | 2944 K (2670.85 °C) |
| Density | 7.15 g/cm³ |
| Discovered | 1797 |
| Common compounds | Cr₂O₃, K₂Cr₂O₇ |
How to type Cr
- Plain text: type
Cr— element symbols are ordinary Latin letters, with the first letter capitalised and the second lowercase. - Subscripts in formulas: use Unicode subscript digits (₀₁₂₃₄₅₆₇₈₉) for formulas such as Cr₂O₃ — copy them from the chemistry keyboard.
- LaTeX: write
\mathrm{Cr}in math mode, or use the mhchem package:\ce{Cr}. - HTML:
Cr; for subscripts use<sub>, e.g.H<sub>2</sub>O.
Frequently asked questions
What is the chemical symbol for chromium?
The chemical symbol for chromium is Cr.
What is the atomic number of chromium?
Chromium has atomic number 24, meaning each atom has 24 protons.
What is the electron configuration of chromium?
The ground-state electron configuration of chromium is [Ar]3d⁵ 4s¹.
Related symbols
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Reference: Chromium on PubChem (NIH)