Manganese (Mn) – element 25
Manganese is a chemical element with the symbol Mn and atomic number 25. It is a transition metal in group 7, period 4 of the periodic table (d-block), and is a solid at room temperature.
Manganese (Mn) has atomic number 25, atomic mass 54.938 u and electron configuration [Ar] 3d5 4s2.
Manganese facts
| Symbol | Mn |
|---|---|
| Atomic number | 25 |
| Atomic mass | 54.938 u (g/mol) |
| Category | transition metal |
| Group | group 7 |
| Period | 4 |
| Block | d-block |
| Phase at 20 °C | Solid |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 4s2 3d5 |
| Noble-gas notation | [Ar] 3d5 4s2 |
| Electrons per shell | 2, 8, 13, 2 |
Bohr model and shells
Manganese has 25 electrons in 4 shells: 2, 8, 13, 2. Full configuration and noble-gas notation are in the table; work out any element or ion with the electron configuration calculator.
Physical and atomic properties
| Melting point | 1519 K (1245.8 °C) |
|---|---|
| Boiling point | 2334 K (2060.8 °C) |
| Density | 7.21 g/cm³ |
| Electronegativity (Pauling) | 1.55 |
| Electron affinity | -50 kJ/mol |
| Ionization energies | 717.3, 1509, 3248 kJ/mol (1st, 2nd, 3rd) |
| Molar heat capacity | 26.32 J/(mol·K) |
| Discovered by | Torbern Olof Bergman |
Use the atomic mass in the molar mass calculator for any formula containing Mn.
Position in the periodic table
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Frequently asked questions
What is the atomic mass of manganese?
The atomic mass of manganese is 54.938 u, so one mole of manganese atoms weighs 54.938 g.
What is the electron configuration of manganese?
Manganese has 25 electrons: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁵, or [Ar] 3d⁵ 4s² in noble-gas notation. Electrons per shell: 2, 8, 13, 2.
Is manganese a metal?
Yes. Manganese is a transition metal.
Where is manganese on the periodic table?
Manganese is in group 7, period 4, in the d-block.
Data: Periodic-Table-JSON (CC BY-SA 3.0); standard atomic weights from IUPAC (abridged). Values in brackets are the mass number of the longest-lived isotope.