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Atomic: M.A.C. | Reference
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Holmium
Electrons per shell 2,8,18,29,8,2
Electron Configuration [Xe] 4f11 6s2 open electron config
Ground state 4I°15/2
Atomic Volume 18.7 cm3 mol-1
Electronegativity 1.23
Magnetic ordering No data
Mass magnetic susceptibility 5.49 x 10-6
Molar magnetic susceptibility 9.05467 x 10-7
Speed of sound 2760 m s-1
Thermal Properties
Enthalpy of Atomization 301 kJ mol-1 @25°C
Enthalpy of Fusion 17.2 kJ mol-1
Enthalpy of Vaporisation 303 kJ mol-1
Heat Capacity 27.15 J mol-1 K-1
Thermal Conductivity 16.2 W m-1 K-1
Thermal Expansion 11.2 μm m-1 K-1
Hardness
Brinell hardness 746 MPa
Vickers hardness 481 MPa
Elastic Properties
Bulk modulus 40.2 GPa
Poisson ratio 0.231
Shear modulus 26.3 GPa
Young's modulus 64.8 GPa
Electrical Properties
Electrical resistivity 9.4 x 10-7 Ω m
Electrical conductivity 0.0124 106/cm Ω
Chemical Properties
Electrochemical Equivalent 2.0512 g Ah-1
Valence Electron Potential (-eV) 47.9
Ionization Potential  
First 6.018
Second 11.805
Third 22.843
Energy Levels
Kα1 (intensity 100) 47.5467 KeV
Kα2 (intensity 50) 46.6997 KeV
Kβ1 (intensity 23.7) 53.877 KeV
Kβ2 (intensity 8.7) 55.1278 KeV
Kβ3 (intensity 9.6) 53.7164 KeV
Lα1 (intensity 100) 6.7198 KeV
Lα2 (intensity 10) 6.6795 KeV
Lβ1 (intensity 43) 7.5253 KeV
Lβ2 (intensity 17) 7.911 KeV
Lβ3 (intensity 9) 7.6502 KeV
Lβ4 (intensity 4) 7.4699 KeV
Lγ1 (intensity 5.8) 8.747 KeV
Lγ2 (intensity 2) 9.0477 KeV
Lγ3 (intensity 2) 6.786 KeV
Ll (intensity 4.5) 5.9398 KeV
Atomic Radii
Empirical 175 pm
Bohr Radius No data.
Covalent Radius No data.
Van der Waals No data.
Triple covalent No data.
Metallic 176.2 pm
Oxidation States
Main Ho+3
Other
Ionisation Energies (kJ mol-1) show graph
M - M+ 580.7
M+ - M2+ 1139
M2+ - M3+ 2204
M3+ - M4+ 4100
Vapour Pressure
P (Pa) 1 10 100 1K 10K 100K
T (K) 1432 1584 (1775) (2040) (2410) (2964)