| Indium | |
| Electrons per shell | 2,8,18,18,3 |
| Electron Configuration | [Kr] 4d10 5s2 5p1 ![]() |
| Ground state | 2P°1/2 |
| 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 |
| Critcal Temperature | No data. |
| Critcal Pressure | No data. |
| Adiabatic index | No data. |
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 | |
| 5.786 | |
| 18.869 | |
| 28.03 | |
| Incompatibilities | Dinitrogen tetraoxide (N2O4), acetonitrile (CH3CN), mercury(II) bromide (at 662°F), sulfur (mixtures ignite when heated). |
Flammability |
|
Energy Levels |
|
| 24.2097 KeV | |
| 24.002 KeV | |
| 27.2759 KeV | |
| 27.8572 KeV | |
| 27.2332 KeV | |
| 3.28694 KeV | |
| 3.27929 KeV | |
| 3.48721 KeV | |
| 3.71381 KeV | |
| 3.5713 KeV | |
| 3.5342 KeV | |
| 3.92081 KeV | |
| 4.1612 KeV | |
| 3.111 KeV | |
| 2.9018 KeV | |
Atomic Radii |
|
| 155 pm | |
| 156 pm | |
| 144 pm | |
| 193 pm | |
| 146 pm | |
| 167 pm | |
Ionic Radii (Å) |
||||
| Charge | Coordination | Crystal | Ionic | Key |
| 3 | IV | 0.76 | 0.62 | |
| VI | 0.94 | 0.8 | R* | |
| VIII | 1.06 | 0.92 | RC | |
| R, From r3 vs V plots. |
| C, Calculated from bond length - bond strength equations. |
| E, Estimated. |
| *, Most Reliable. |
| M, From Metallic Oxides. |
| A, Ahrens (1952) Ionic radius. |
| P, Pauling's (1960) Crystal Radius. |
Oxidation States |
|
| In+3 | |
| In+1, In+2 | |
Ionisation Energies (kJ mol-1) ![]() |
|
| 558.3 | |
| 1820.6 | |
| 2704 | |
| 5200 | |
| 7400 | |
| 9500 | |
| 11700 | |
| 13900 | |
| 17200 | |
| 19700 | |
Vapour Pressure |
||||||
| P (Pa) | 1 | 10 | 100 | 1K | 10K | 100K |
| T (K) | 1196 | 1325 | 1485 | 1690 | 1962 | 2340 |
Crystal Structure |
|
| Tetragonal | |
![]() |
a = 325.23 pm |
| b = 325.23 pm | |
| c = 494.61 pm | |
| α = 90° | |
| β = 90° | |
| γ = 90° | |