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| Ìfarahàn |
| silvery white |
| Àwọn ìní àníkárí |
| Orúkọ, àmì-ìdámọ̀, nọ́mbà |
thorium, Th, 90 |
| Ẹ̀ka apilẹ̀sẹ̀ |
actinide |
| Àdìpọ̀, ìgbà, block |
n/a, 7, f |
| Ìwúwo átọ́mù |
232.0381 g·mol−1 |
| Ìtòjọ ẹ̀lẹ́ktrónì |
[Rn] 6d2 7s2 |
| Àwọn ẹ̀lẹ́ktrónì lórí ọ̀nà kan |
2, 8, 18, 32, 18, 10, 2 (Image) |
| Àwọn ìní aláfójúrí |
| Phase |
solid |
| Kíki (tó súnmọ́ r.t.) |
11.7 g·cm−3 |
| ojúàmì ìyọ́ |
2115 K, 1842 °C, 3348 °F |
| ajúàmì ìhó |
5061 K, 4788 °C, 8650 °F |
| Heat of fusion |
13.81 kJ·mol−1 |
| Heat of vaporization |
514 kJ·mol−1 |
| Specific heat capacity |
(25 °C) 26.230 J·mol−1·K−1 |
| Vapor pressure |
| P/Pa |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T/K |
2633 |
2907 |
3248 |
3683 |
4259 |
5055 |
|
| Atomic properties |
| Oxidation states |
4, 3, 2 (weakly basic oxide) |
| Electronegativity |
1.3 (Pauling scale) |
| Ionization energies |
1st: 587 kJ·mol−1 |
| 2nd: 1110 kJ·mol−1 |
| 3rd: 1930 kJ·mol−1 |
| Atomic radius |
179 pm |
| Covalent radius |
206±6 pm |
| Miscellanea |
| Crystal structure |
face-centered cubic |
| Magnetic ordering |
paramagnetic[1] |
| Electrical resistivity |
(0 °C) 147 nΩ·m |
| Thermal conductivity |
(300 K) 54.0 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 11.0 µm·m−1·K−1 |
| Speed of sound (thin rod) |
(20 °C) 2490 m/s |
| Young's modulus |
79 GPa |
| Shear modulus |
31 GPa |
| Bulk modulus |
54 GPa |
| Poisson ratio |
0.27 |
| Mohs hardness |
3.0 |
| Vickers hardness |
350 MPa |
| Brinell hardness |
400 MPa |
| CAS registry number |
7440-29-1 |
| Most stable isotopes |
| Main article: Isotopes of thorium |
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Tóríọ̀m tabi Thorium je apilese kemika to ni ami-idamo Th ati nomba atomu 90.
Thorium je onide alagbararadio to sele ladanida.
