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|
Thulium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Tm | 69 | 168.93421 | 1545 °C | 1950 °C | Solid | 9.32 g/cm3 | Metal |
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Thulium Properties and Compounds
|
|
|
| General |
| Name, Symbol, Number |
thulium, Tm, 69 |
| Chemical series |
lanthanides |
| Group, Period, Block |
n/a, 6, f |
| Appearance |
silvery gray
 |
| Standard atomic weight |
168.93421(2) g·mol−1 |
| Electron configuration |
[Xe] 4f13 6s2 |
| Electrons per shell |
2, 8, 18, 31, 8, 2 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
9.32 g·cm−3 |
| Liquid density at m.p. |
8.56 g·cm−3 |
| Melting point |
1818 K
(1545 °C, 2813 °F) |
| Boiling point |
2223 K
(1950 °C, 3542 °F) |
| Heat of fusion |
16.84 kJ·mol−1 |
| Heat of vaporization |
247 kJ·mol−1 |
| Heat capacity |
(25 °C) 27.03 J·mol−1·K−1 |
Vapor pressure
| P(Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T(K) |
1117 |
1235 |
1381 |
1570 |
(1821) |
(2217) |
|
| Atomic properties |
| Crystal structure |
hexagonal |
| Oxidation states |
3
(basic oxide) |
| Electronegativity |
1.25 (scale Pauling) |
Ionization energies
(more) |
1st: 596.7 kJ·mol−1 |
| 2nd: 1160 kJ·mol−1 |
| 3rd: 2285 kJ·mol−1 |
| Atomic radius |
175 pm |
| Atomic radius (calc.) |
222 pm |
| Miscellaneous |
| Magnetic ordering |
no data |
| Electrical resistivity |
(r.t.) (poly) 676 nΩ·m |
| Thermal conductivity |
(300 K) 16.9 W·m−1·K−1 |
| Thermal expansion |
(r.t.) (poly)
13.3 µm/(m·K) |
| Young's modulus |
74.0 GPa |
| Shear modulus |
30.5 GPa |
| Bulk modulus |
44.5 GPa |
| Poisson ratio |
0.213 |
| Vickers hardness |
520 MPa |
| Brinell hardness |
471 MPa |
| CAS registry number |
7440-30-4 |
| Selected isotopes |
|
|
| References |
|
Thulium Compounds
|
Source: Wikipedia article Thulium
|
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Chemistry Quick Facts
