24Cr51.996
Chromium (Cr)
Element 24 Ā· Transition metal
Chromium (Cr) is a chemical element with atomic number 24. It is classified as a transition metal in period 4, group 6 of the periodic table (the d-block). Its standard atomic weight is 51.996 u and its ground-state electron configuration is [Ar] 3dāµ 4sĀ¹.
Chromium facts
| Atomic number (Z) | 24 |
|---|---|
| Symbol | Cr |
| Standard atomic weight | 51.996 u |
| Category | Transition metal |
| Group | 6 |
| Period | 4 |
| Block | d-block |
| Electron configuration | [Ar] 3dāµ 4sĀ¹ |
| Electronegativity (Pauling) | 1.66 |
| State at 20 Ā°C | Solid |
| Protons / electrons | 24 / 24 |
| Neutrons (most common isotope, approx.) | 28 |
| Molar mass | 51.996 g/mol |