| Erbium | |
| Electrons per shell | 2,8,18,30,8,2 |
| Electron Configuration | [Xe] 4f12 6s2 ![]() |
| Ground state | 3H6 |
| Atomic Volume | 18.4 cm3 mol-1 |
| Electronegativity | 1.24 |
| Magnetic ordering | No data |
| Mass magnetic susceptibility | 3.77 x 10-6 |
| Molar magnetic susceptibility | 6.30566 x 10-7 |
| Speed of sound | 2830 m s-1 |
Thermal Properties |
|
| Enthalpy of Atomization | 314 kJ mol-1 @25°C |
| Enthalpy of Fusion | 17.2 kJ mol-1 |
| Enthalpy of Vaporisation | 280 kJ mol-1 |
| Heat Capacity | 28.12 J mol-1 K-1 |
| Thermal Conductivity | 14.5 W m-1 K-1 |
| Thermal Expansion | 12.2 μm m-1 K-1 |
| Critcal Temperature | No data. |
| Critcal Pressure | No data. |
| Adiabatic index | No data. |
Hardness |
|
| Brinell hardness | 814 MPa |
| Vickers hardness | 589 MPa |
Elastic Properties |
|
| Bulk modulus | 44.4 GPa |
| Poisson ratio | 0.237 |
| Shear modulus | 28.3 GPa |
| Young's modulus | 69.9 GPa |
Electrical Properties |
|
| Electrical resistivity | 8.6 x 10-7 Ω m |
| Electrical conductivity | 0.0117 106/cm Ω |
Chemical Properties |
|
| Electrochemical Equivalent | 2.0802 g Ah-1 |
| Valence Electron Potential (-eV) | 49 |
| Ionization Potential | |
| 6.101 | |
| 11.929 | |
| 22.739 | |
Energy Levels |
|
| 49.1277 KeV | |
| 48.2211 KeV | |
| 55.681 KeV | |
| 56.9286 KeV | |
| 55.5145 KeV | |
| 6.9487 KeV | |
| 6.905 KeV | |
| 7.8109 KeV | |
| 8.189 KeV | |
| 7.9375 KeV | |
| 7.7437 KeV | |
| 9.089 KeV | |
| 9.3881 KeV | |
| 7.056 KeV | |
| 6.1379 KeV | |
Atomic Radii |
|
| 175 pm | |
| 226 pm | |
| No data. | |
| No data. | |
| No data. | |
| 176.1 pm | |
Ionic Radii (Å) |
||||
| Charge | Coordination | Crystal | Ionic | Key |
| 3 | VI | 1.03 | 0.89 | R |
| VII | 1.085 | 0.945 | ||
| VIII | 1.144 | 1.004 | R | |
| IX | 1.202 | 1.062 | R | |
| 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 |
|
| Er+3 | |
Ionisation Energies (kJ mol-1) ![]() |
|
| 588.7 | |
| 1151 | |
| 2194 | |
| 4115 | |
Vapour Pressure |
||||||
| P (Pa) | 1 | 10 | 100 | 1K | 10K | 100K |
| T (K) | 1504 | 1663 | (1885) | (2163) | (2552) | (3132) |
Crystal Structure |
|
| Hexagonal close packed | |
![]() |
a = 355.88 pm |
| b = 355.88 pm | |
| c = 558.74 pm | |
| α = 90° | |
| β = 90° | |
| γ = 120° | |