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Chemical element · Atomic number 25
Manganese (Mn)
Transition metals · Period 4 · Solid
Element identity
- Atomic number (Z)
- 25
- Symbol
- Mn
- Atomic weight / isotope mass number
- 54.938 043(2)
- Category
- Transition metals
- Physical state (reference)
- Solid
- Period
- 4
- Group (reference)
- 7
- Block
- d
Physical properties
- Appearance
- Silvery metallic
- Density
- 7.21 g·cm⁻³
- Melting point
- 1519 K / 1246 °C / 2275 °F
- Boiling point
- 2334 K / 2061 °C / 3742 °F
- Sublimation point
- Not available
Atomic and material properties
- Electron configuration
- [Ar] 3d⁵ 4s²
- Electrons per shell
- K2 L8 M13 N2
- Oxidation states
- 7, 6, 5, 4, 3, 2, 1, −1, −2, −3
- Electronegativity (Pauling)
- 1.55
- Atomic radius
- 161 pm
- Covalent radius
- Low spin: 139±5 pm High spin: 161±8 pm
- Molar ionization energies
- 1st: 717.3 kJ·mol⁻¹ 2nd: 1509.0 kJ·mol⁻¹ 3rd: 3248 kJ·mol⁻¹ 4th: 4940 kJ·mol⁻¹ 5th: 6990 kJ·mol⁻¹ 6th: 9220 kJ·mol⁻¹ 7th: 11,500 kJ·mol⁻¹ 8th: 18,770 kJ·mol⁻¹ 9th: 21,400 kJ·mol⁻¹ 10th: 23,960 kJ·mol⁻¹ 11th: 27,590 kJ·mol⁻¹ 12th: 30,330 kJ·mol⁻¹ 13th: 33,150 kJ·mol⁻¹ 14th: 38,880 kJ·mol⁻¹ 15th: 41,987 kJ·mol⁻¹ 16th: 109,480 kJ·mol⁻¹ 17th: 118,100 kJ·mol⁻¹ 18th: 127,100 kJ·mol⁻¹ 19th: 138,600 kJ·mol⁻¹ 20th: 148,500 kJ·mol⁻¹ 21st: 158,600 kJ·mol⁻¹ 22nd: 172,500 kJ·mol⁻¹ 23rd: 181,380 kJ·mol⁻¹ 24th: 785,450 kJ·mol⁻¹ 25th: 827,067 kJ·mol⁻¹
- Thermal conductivity
- 7.81 W·m⁻¹·K⁻¹
- Molar heat capacity
- 26.32 J·mol⁻¹·K⁻¹
- Crystal structure
- Body-centered cubic
- CAS number
- 7439-96-5
Property source: Wikipedia — Manganese, adapted from the Nuclides App snapshot. Quoted conditions and qualifiers are retained.
Sources and interpretation
Snapshot exported 24 October 2026 from the element assets used by Nuclides. Properties are a reference compilation, not a new evaluation. Missing values are shown as “Not available”. Density and phase depend on temperature, pressure and allotrope; retained conditions are part of the quoted property.
Atomic weight is dimensionless. Parentheses give uncertainty in the last quoted digits. A single integer in square brackets is an isotope mass number, not a standard atomic weight. The snapshot can differ from current evaluations; consult CIAAW standard atomic weights and the IUPAC periodic table for current values and conventions.
Element properties in the App snapshot are adapted from Wikipedia. Each element page links to its source article; text adaptations are available under CC BY-SA 4.0. No third-party images are included.
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