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Indium
Electrons per shell 2,8,18,18,3
Electron Configuration [Kr] 4d10 5s2 5p1 open electron config
Ground state 21/2
Atomic Volume 15.7 cm3 mol-1
Electronegativity 1.78
Magnetic ordering No data
Mass magnetic susceptibility -1.4 x 10-9
Molar magnetic susceptibility -1.61 x 10-10
Speed of sound 1215 m s-1
Thermal Properties
Enthalpy of Atomization 242.7 kJ mol-1 @25°C
Enthalpy of Fusion 3.27 kJ mol-1
Enthalpy of Vaporisation 231.8 kJ mol-1
Heat Capacity 26.74 J mol-1 K-1
Thermal Conductivity 81.8 W m-1 K-1
Thermal Expansion 32.1 μm m-1 K-1
Hardness
Brinell hardness 8.83 MPa
Mohs hardness 1.2
Elastic Properties
Young's modulus 11 GPa
Electrical Properties
Electrical resistivity 8 x 10-8 Ω m
Electrical conductivity 0.116 106/cm Ω
Chemical Properties
Electrochemical Equivalent 1.428 g Ah-1
Electron Work Function 4.12 eV
Valence Electron Potential (-eV) 54
Ionization Potential  
First 5.786
Second 18.869
Third 28.03
Incompatibilities Dinitrogen tetraoxide (N2O4), acetonitrile (CH3CN), mercury(II) bromide (at 662°F), sulfur (mixtures ignite when heated).
Flammability
Non-combustible solid (except as dust)
Energy Levels
Kα1 (intensity 100) 24.2097 KeV
Kα2 (intensity 50) 24.002 KeV
Kβ1 (intensity 19) 27.2759 KeV
Kβ2 (intensity 5) 27.8572 KeV
Kβ3 (intensity 8.4) 27.2332 KeV
Lα1 (intensity 100) 3.28694 KeV
Lα2 (intensity 10) 3.27929 KeV
Lβ1 (intensity 45) 3.48721 KeV
Lβ2 (intensity 12.5) 3.71381 KeV
Lβ3 (intensity 8) 3.5713 KeV
Lβ4 (intensity 4) 3.5342 KeV
Lγ1 (intensity 3.5) 3.92081 KeV
Lγ2 (intensity 1) 4.1612 KeV
Lγ3 (intensity 2) 3.111 KeV
Ll (intensity 5) 2.9018 KeV
Atomic Radii
Empirical 155 pm
Bohr Radius 156 pm
Covalent Radius 144 pm
Van der Waals 193 pm
Triple covalent 146 pm
Metallic 167 pm
Oxidation States
Main In+3
Other In+1, In+2
Ionisation Energies (kJ mol-1) show graph
M - M+ 558.3
M+ - M2+ 1820.6
M2+ - M3+ 2704
M3+ - M4+ 5200
M4+ - M5+ 7400
M5+ - M6+ 9500
M6+ - M7+ 11700
M7+ - M8+ 13900
M8+ - M9+ 17200
M9+ - M10+ 19700
Vapour Pressure
P (Pa) 1 10 100 1K 10K 100K
T (K) 1196 1325 1485 1690 1962 2340
Crystal Structure
Structure Tetragonal
a = 325.23 pm
b = 325.23 pm
c = 494.61 pm
α = 90°
β = 90°
γ = 90°