| Terbium | |
| Electrons per shell | 2,8,18,27,8,2 |
| Electron Configuration | [Xe] 4f9 6s2 ![]() |
| Ground state | 6H°15/2 |
| Atomic Volume | 19.2 cm3 mol-1 |
| Electronegativity | 1.1 |
| Magnetic ordering | Ferromagnetic |
| Mass magnetic susceptibility | 0.0000136 |
| Molar magnetic susceptibility | 2.161385 x 10-6 |
| Speed of sound | 2620 m s-1 |
Thermal Properties |
|
| Enthalpy of Atomization | 314 kJ mol-1 @25°C |
| Enthalpy of Fusion | 16.3 kJ mol-1 |
| Enthalpy of Vaporisation | 391 kJ mol-1 |
| Heat Capacity | 28.91 J mol-1 K-1 |
| Thermal Conductivity | 11.1 W m-1 K-1 |
| Thermal Expansion | 10.3 μm m-1 K-1 |
| Critcal Temperature | No data. |
| Critcal Pressure | No data. |
| Adiabatic index | No data. |
Hardness |
|
| Brinell hardness | 677 MPa |
| Vickers hardness | 863 MPa |
Elastic Properties |
|
| Bulk modulus | 38.7 GPa |
| Poisson ratio | 0.261 |
| Shear modulus | 22.1 GPa |
| Young's modulus | 55.7 GPa |
Electrical Properties |
|
| Electrical resistivity | 1.20 x 10-6 Ω m |
| Electrical conductivity | 0.00889 106/cm Ω |
Chemical Properties |
|
| Electrochemical Equivalent | 1.9765 g Ah-1 |
| Electron Work Function | 3 eV |
| Valence Electron Potential (-eV) | 46.8 |
| Ionization Potential | |
| 5.86 | |
| 11.525 | |
| 21.91 | |
Energy Levels |
|
| 44.4816 KeV | |
| 43.7441 KeV | |
| 50.382 KeV | |
| 51.6074 KeV | |
| 50.2341 KeV | |
| 6.2728 KeV | |
| 6.238 KeV | |
| 6.978 KeV | |
| 7.3667 KeV | |
| 7.0965 KeV | |
| 6.941 KeV | |
| 8.102 KeV | |
| 8.3908 KeV | |
| 6.282 KeV | |
| 5.5521 KeV | |
Atomic Radii |
|
| 175 pm | |
| 225 pm | |
| No data. | |
| No data. | |
| No data. | |
| 177.3 pm | |
Ionic Radii (Å) |
||||
| Charge | Coordination | Crystal | Ionic | Key |
| 3 | VI | 1.063 | 0.923 | R |
| VII | 1.12 | 0.98 | E | |
| VIII | 1.18 | 1.04 | R | |
| IX | 1.235 | 1.095 | R | |
| 4 | VI | 0.9 | 0.76 | R |
| VIII | 1.02 | 0.88 | ||
| 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 |
|
| Tb+3 | |
| Tb+4 | |
Ionisation Energies (kJ mol-1) ![]() |
|
| 564.6 | |
| 1112 | |
| 2114 | |
| 3839 | |
Vapour Pressure |
||||||
| P (Pa) | 1 | 10 | 100 | 1K | 10K | 100K |
| T (K) | 1789 | 1979 | (2201) | (2505) | (2913) | (3491) |
Crystal Structure |
|
| Hexagonal close packed | |
![]() |
a = 360.1 pm |
| b = 360.1 pm | |
| c = 569.36 pm | |
| α = 90° | |
| β = 90° | |
| γ = 120° | |