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Manganese (Mn)
Atomic number 25 · transition
| Atomic number | 25 |
|---|---|
| Atomic mass | 54.93804 u |
| Molar mass | 54.93804 g/mol |
| Category | transition |
| Group / period / block | 7 / 4 / d |
| Electron configuration | [Ar] 3d5 4s2 |
| Electrons per shell | 2, 8, 13, 2 |
| Electronegativity (Pauling) | 1.55 |
| Atomic radius | 140.0 pm |
| Density | 7.3 g/cm³ |
| First ionisation energy | 7.434 eV |
| Melting point | 1519.15 K (1246.00 °C) |
| Boiling point | 2334.15 K (2061.00 °C) |
| Common oxidation states | +2, +4, +7 |
| Abundance in Earth's crust | 950 ppm |
Uses
Steel making, dry-cell batteries
Discovery
1774, Johann Gahn