Terbium
Lát'ọwọ́ Wikipedia, ìwé ìmọ̀ ọ̀fẹ́
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| Ìfarahàn |
silvery white
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| Àwọn ìní àníkárí |
| Orúkọ, àmì-ìdámọ̀, nọ́mbà |
terbium, Tb, 65 |
| Ìpè |
/ˈtɜrbiəm/ TER-bee-əm |
| Ẹ̀ka apilẹ̀sẹ̀ |
lanthanide |
| Àdìpọ̀, ìgbà, block |
n/a, 6, f |
| Ìwúwo átọ́mù |
158.92535 g·mol−1 |
| Ìtòjọ ẹ̀lẹ́ktrónì |
[Xe] 4f9 6s2 |
| Àwọn ẹ̀lẹ́ktrónì lórí ọ̀nà kan |
2, 8, 18, 27, 8, 2 (Image) |
| Àwọn ìní aláfójúrí |
| Phase |
solid |
| Kíki (tó súnmọ́ r.t.) |
8.23 g·cm−3 |
| Liquid density at m.p. |
7.65 g·cm−3 |
| ojúàmì ìyọ́ |
1629 K, 1356 °C, 2473 °F |
| ajúàmì ìhó |
3503 K, 3230 °C, 5846 °F |
| Heat of fusion |
10.15 kJ·mol−1 |
| Heat of vaporization |
293 kJ·mol−1 |
| Specific 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) |
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| Atomic properties |
| Oxidation states |
4, 3, 2, 1
(weakly basic oxide) |
| Electronegativity |
? 1.2 (Pauling scale) |
| Ionization energies |
1st: 565.8 kJ·mol−1 |
| 2nd: 1110 kJ·mol−1 |
| 3rd: 2114 kJ·mol−1 |
| Atomic radius |
177 pm |
| Covalent radius |
194±5 pm |
| Miscellanea |
| Crystal structure |
hexagonal |
| Magnetic ordering |
paramagnetic at 300 K |
| 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 |
| Most stable isotopes |
| Main article: Isotopes of terbium |
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