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Atomic: M.A.C. | Reference
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Manganese
Electrons per shell 2,8,13,2
Electron Configuration [Ar] 3d5 4s2 open electron config
Ground state 6S5/2
Atomic Volume 1.39 cm3 mol-1
Electronegativity 1.55
Magnetic ordering Non-magnetic
Mass magnetic susceptibility 1.21 x 10-7
Molar magnetic susceptibility 6.6475 x 10-9
Speed of sound 5150 m s-1
Thermal Properties
Enthalpy of Atomization 280.3 kJ mol-1 @25°C
Enthalpy of Fusion 14.4 kJ mol-1
Enthalpy of Vaporisation 220.5 kJ mol-1
Heat Capacity 26.32 J mol-1 K-1
Thermal Conductivity 7.81 W m-1 K-1
Thermal Expansion 21.7 μm m-1 K-1
Hardness
Brinell hardness 196 MPa
Mohs hardness 6.0
Elastic Properties
Bulk modulus 120 GPa
Young's modulus 198 GPa
Electrical Properties
Electrical resistivity 1.60 x 10-6 Ω m
Electrical conductivity 0.00695 106/cm Ω
Chemical Properties
Electrochemical Equivalent 0.29282 g Ah-1
Electron Work Function 4.1 eV
Valence Electron Potential (-eV) 220
Ionization Potential  
First 7.435
Second 15.64
Third 33.667
Incompatibilities Oxidizers.
Flammability
Combustible Solid
Energy Levels
Kα1 (intensity 100) 5.89875 KeV
Kα2 (intensity 50) 5.88765 KeV
Kβ1 (intensity 19.5) 6.49045 KeV
Lα1 (intensity 100) 0.6374 KeV
Lα2 (intensity 10) 0.6374 KeV
Lβ1 (intensity 20.9) 0.6488 KeV
Lβ3 (intensity 0.5) 0.721 KeV
Lβ4 (intensity 0.5) 0.721 KeV
Lγ3 (intensity 20) 0.567 KeV
Ll (intensity 50) 0.5549 KeV
Atomic Radii
Empirical 140 pm
Bohr Radius 161 pm
Covalent Radius 139 pm
Van der Waals No data.
Triple covalent 103 pm
Metallic 127 pm
Oxidation States
Main Mn+2
Other Mn-3, Mn-2, Mn-1, Mn0, Mn+1, Mn+3, Mn+4, Mn+5, Mn+6, Mn+7
Ionisation Energies (kJ mol-1) show graph
M - M+ 717.4
M+ - M2+ 1509.0
M2+ - M3+ 3248.4
M3+ - M4+ 4940
M4+ - M5+ 6990
M5+ - M6+ 9200
M6+ - M7+ 11508
M7+ - M8+ 18956
M8+ - M9+ 21400
M9+ - M10+ 23960
Vapour Pressure
P (Pa) 1 10 100 1K 10K 100K
T (K) 1228 1347 1493 1691 1955 2333
Crystal Structure
Structure Cubic
a = 891.25 pm
b = 891.25 pm
c = 891.25 pm
α = 90°
β = 90°
γ = 90°