Manganese (Mn)
Manganese is the chemical element with atomic number 25 and symbol Mn. It is a transition metal in period 4, group 7, with a standard atomic weight of 54.938 u.
Key facts
- Z
- 25
- Atomic weight
- 54.938 u
- Category
- transition metal
- State at 298 K
- Solid
- Occurrence
- primordial
- Discovered
- 1774
- CAS
- 7439-96-5
Measured properties
| Property | Value | Source |
|---|---|---|
| Electronegativity | 1.55 | National Center for Biotechnology Information (NIH) |
| Melting point | 1,519 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 2,334 K | National Center for Biotechnology Information (NIH) |
| Density stp | 7.3 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 197 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 717.3 kJ/mol | National Center for Biotechnology Information (NIH) |
Electron configuration
- Noble gas notation
- [Ar] 3d⁵ 4s²
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s²
- Electrons per shell
- 2, 8, 13, 2