25Mn54.938
Manganese (Mn)
Element 25 Ā· Transition metal
Manganese (Mn) is a chemical element with atomic number 25. It is classified as a transition metal in period 4, group 7 of the periodic table (the d-block). Its standard atomic weight is 54.938 u and its ground-state electron configuration is [Ar] 3dāµ 4sĀ².
Manganese facts
| Atomic number (Z) | 25 |
|---|---|
| Symbol | Mn |
| Standard atomic weight | 54.938 u |
| Category | Transition metal |
| Group | 7 |
| Period | 4 |
| Block | d-block |
| Electron configuration | [Ar] 3dāµ 4sĀ² |
| Electronegativity (Pauling) | 1.55 |
| State at 20 Ā°C | Solid |
| Protons / electrons | 25 / 25 |
| Neutrons (most common isotope, approx.) | 30 |
| Molar mass | 54.938 g/mol |