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|
Terbium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Tb | 65 | 158.92535 | 1356 °C | 3230 °C | Solid | 8.23 g/cm3 | Metal |
|
|
|
| General |
| Name, Symbol, Number |
terbium, Tb, 65 |
| Chemical series |
lanthanides |
| Group, Period, Block |
n/a, 6, f |
| Appearance |
silvery white
 |
| Standard atomic weight |
158.92535(2) g·mol−1 |
| Electron configuration |
[Xe] 4f9 6s2 |
| Electrons per shell |
2, 8, 18, 27, 8, 2 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
8.23 g·cm−3 |
| Liquid density at m.p. |
7.65 g·cm−3 |
| Melting point |
1629 K
(1356 °C, 2473 °F) |
| Boiling point |
3503 K
(3230 °C, 5846 °F) |
| Heat of fusion |
10.15 kJ·mol−1 |
| Heat of vaporization |
293 kJ·mol−1 |
| Heat capacity |
(25 °C) 28.91 J·mol−1·K−1 |
Vapor pressure
| P(Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T(K) |
1789 |
1979 |
(2201) |
(2505) |
(2913) |
(3491) |
|
| Atomic properties |
| Crystal structure |
hexagonal |
| Oxidation states |
3, 4
(weakly basic oxide) |
| Electronegativity |
? 1.2 (scale Pauling) |
Ionization energies
(more) |
1st: 565.8 kJ·mol−1 |
| 2nd: 1110 kJ·mol−1 |
| 3rd: 2114 kJ·mol−1 |
| Atomic radius |
175 pm |
| Atomic radius (calc.) |
225 pm |
| Miscellaneous |
| Magnetic ordering |
ferromagnetic
in dry ice [1] |
| Electrical resistivity |
(r.t.) (α, poly)
1.150 µΩ·m |
| Thermal conductivity |
(300 K) 11.1 W·m−1·K−1 |
| Thermal expansion |
(r.t.) (α, poly)
10.3 µm/(m·K) |
| Speed of sound (thin rod) |
(20 °C) 2620 m/s |
| Young's modulus |
(α form) 55.7 GPa |
| Shear modulus |
(α form) 22.1 GPa |
| Bulk modulus |
(α form) 38.7 GPa |
| Poisson ratio |
(α form) 0.261 |
| Vickers hardness |
863 MPa |
| Brinell hardness |
677 MPa |
| CAS registry number |
7440-27-9 |
| Selected isotopes |
|
|
| References |
|
Terbium Compounds
|
Source: Wikipedia article Terbium
|
|
Chemistry Quick Facts
