25MnManganese54.938043 u
Manganese (Mn)
Manganese is a transition metal with atomic number 25, in period 4 and group 7 of the periodic table. Its atomic mass is 54.938043 u and its electron configuration is [Ar] 3d⁵ 4s². Solid at 25 °C.
Key facts
| Atomic number | 25 |
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| Atomic mass | 54.938043 u |
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| Category | Transition Metal |
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| Period | 4 |
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| Group | 7 |
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| Block | d |
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| Electron configuration | [Ar] 3d⁵ 4s² |
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| Electrons per shell | 2, 8, 13, 2 |
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| Electronegativity (Pauling) | 1.55 |
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| Oxidation states | −3, −2, −1, +1, +2, +3, +4, +5, +6, +7common in bold |
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| State at 25 °C | Solid |
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| Melting point | 1519 K1245.85 °C |
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| Boiling point | 2334 K2060.85 °C |
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| Density | 7.3 g/cm³ |
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Atomic properties
| First ionization energy | 7.434 eV |
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| Electron affinity | 0 kJ/mol |
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| Atomic radius | 127 pm |
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| Covalent radius | 139 pm |
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| Van der Waals radius | 197 pm |
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| Common ions | Mn²⁺, Mn⁴⁺ |
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| Protons, neutrons, electrons | 25, 30, 25 |
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Physical and thermal properties
| Molar volume | 7.35 cm³/mol |
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| Heat of fusion | 13.2 kJ/mol |
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| Heat of vaporization | 220 kJ/mol |
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| Specific heat | 479 J/(kg·K) |
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| Thermal conductivity | 7.7 W/(m·K) |
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| Thermal expansion | 2.17 × 10⁻⁵ K⁻¹ |
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| Mohs hardness | 6 |
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| Young’s modulus | 198 GPa |
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| Crystal structure | Body-centered cubic |
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| Magnetic type | Paramagnetic |
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Identification and history
| CAS number | 7439-96-5 |
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| Latin name | Manganum |
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| Discovered by | Carl Wilhelm Scheele · 1774 |
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| Named by | --- |
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Natural isotopes
| Isotope | Mass (u) | Abundance |
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| 55Mn | 54.938043 | 100 % |
Data checked against PubChem (NIH), IUPAC, the NIST Atomic Spectra Database and the IAEA (NUBASE and AME), the same data you see in the app.
A dash (---) means there is no reliable published measurement. The app never makes one up.
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Periodic Table