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Atomic: M.A.C. | Reference
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Samarium
Electrons per shell 2,8,18,24,8,2
Electron Configuration [Xe] 4f6 6s2 open electron config
Ground state 7F0
Atomic Volume 19.95 cm3 mol-1
Electronegativity 1.17
Magnetic ordering Antiferromagnetic
Mass magnetic susceptibility 1.11 x 10-7
Molar magnetic susceptibility 1.669 x 10-8
Speed of sound 2130 m s-1
Thermal Properties
Enthalpy of Atomization 209 kJ mol-1 @25°C
Enthalpy of Fusion 10.9 kJ mol-1
Enthalpy of Vaporisation 164.8 kJ mol-1
Heat Capacity 29.54 J mol-1 K-1
Thermal Conductivity 13.3 W m-1 K-1
Thermal Expansion 12.7 μm m-1 K-1
Hardness
Brinell hardness 441 MPa
Vickers hardness 412 MPa
Elastic Properties
Bulk modulus 37.8 GPa
Poisson ratio 0.274
Shear modulus 19.5 GPa
Young's modulus 49.7 GPa
Electrical Properties
Electrical resistivity 9.4 x 10-7 Ω m
Electrical conductivity 0.00956 106/cm Ω
Chemical Properties
Electrochemical Equivalent 1.87 g Ah-1
Electron Work Function 2.7 eV
Valence Electron Potential (-eV) 44.8
Ionization Potential  
First 5.64
Second 11.069
Third 23.423
Energy Levels
Kα1 (intensity 100) 40.1181 KeV
Kα2 (intensity 50) 39.5224 KeV
Kβ1 (intensity 22.4) 45.413 KeV
Kβ2 (intensity 7.7) 46.5438 KeV
Kβ3 (intensity 9.2) 45.2836 KeV
Lα1 (intensity 100) 5.6361 KeV
Lα2 (intensity 10) 5.609 KeV
Lβ1 (intensity 46) 6.2051 KeV
Lβ2 (intensity 17) 6.586 KeV
Lβ3 (intensity 9) 6.3165 KeV
Lβ4 (intensity 4) 6.193 KeV
Lγ1 (intensity 6) 7.178 KeV
Lγ2 (intensity 2.2) 7.4625 KeV
Lγ3 (intensity 2) 5.587 KeV
Ll (intensity 5) 4.9929 KeV
Atomic Radii
Empirical 185 pm
Bohr Radius 238 pm
Covalent Radius No data.
Van der Waals No data.
Triple covalent No data.
Metallic 180.4 pm
Oxidation States
Main Sm+3
Other Sm+2
Ionisation Energies (kJ mol-1) show graph
M - M+ 543.3
M+ - M2+ 1068
M2+ - M3+ 2260
M3+ - M4+ 3990
Vapour Pressure
P (Pa) 1 10 100 1K 10K 100K
T (K) 1001 1106 1240 (1421) (1675) (2061)
Crystal Structure
Structure Trigonal
a = 362.1 pm
b = 362.1 pm
c = 2625 pm
α = 90°
β = 90°
γ = 120°