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Manganese

Metalsolid
Symbol: Mn
Atomic number: 25
Atomic mass: 54.93805
Group: Transition Metal
CAS-number: 7439-96-5

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Physical data
Isotopes
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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 13, 2
Orbitals: [Ar] 3d5 4s2
Electronegativity: 1.5, 1.6
1. Ionization potential: 7.4340 eV
2. Ionization potential: 15.64 eV
3. Ionization potential: 33.667 eV
Oxidation states: 7, 6, 4, 3, 2, 0, -1
Electrical conductivity: 0.00695 10^6
Melting point: 1244 °C
Boiling point: 2061 °C
Specific heat: 0.48 J/gK
Heat of fusion: 12.050 kJ/mol
Heat of vaporization: 226.0 kJ/mol
Thermal conductivity: 0.0782 W/cmK
Atomic radius: 1.79 Å
Ionic radius: 0.67 Å (+2)
Covalent radius: 1.17 Å
Atomic volume: 7.39 cm³/mol
Density (293 K): 7.43 g/cm³
Crystal structure: cubic body centered
cubic body centered

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
52Mn 0 52 6 5.591d EC, β+ View
52Mnm 0 52 2 21.1m β+, EC, IT View
53Mn 0 52.9413 7/2 3.7E06y EC View
54Mn 0 53.9402 3 312.2d EC View
55Mn 100 54.938 5/2 -- --
56Mn 0 56 3 2.578h β- View
57Mn 0 57 5/2 1.45m β- View

Other info

Name origin:Latin: magnes (magnet); Italian: manganese
Description:Hard, brittle, gray-white metal with a pinkish tinge. Rusts like iron in moist air.
Discovered by:Johann Gahn
Year:1774
Place:Sweden
Sources:Most abundant ores are pyrolusite (MnO2), psilomelane [(Ba,H2O)2Mn5O10] and rhodochrosite (MnCO3). Pure metal produced by mixing MnO2 with powered Al and ignited in a furnace.
Use(s):Used in steel, batteries and ceramics. The steel in railroad tracks can contain as much as 1.2% manganese. It is crucial to the effectiveness of vitamin B1.