Tantalum
Lát'ọwọ́ Wikipedia, ìwé ìmọ̀ ọ̀fẹ́
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| Ìfarahàn |
gray blue
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| Àwọn ìní àníkárí |
| Orúkọ, àmì-ìdámọ̀, nọ́mbà |
tantalum, Ta, 73 |
| Ìpè |
/ˈtæntələm/ TAN-təl-əm; previously /tænˈtæliəm/ tan-TAL-ee-əm |
| Ẹ̀ka apilẹ̀sẹ̀ |
transition metal |
| Àdìpọ̀, ìgbà, block |
5, 6, d |
| Ìwúwo átọ́mù |
180.94788 g·mol−1 |
| Ìtòjọ ẹ̀lẹ́ktrónì |
[Xe] 4f14 5d3 6s2 |
| Àwọn ẹ̀lẹ́ktrónì lórí ọ̀nà kan |
2, 8, 18, 32, 11, 2 (Image) |
| Àwọn ìní aláfójúrí |
| Phase |
solid |
| Kíki (tó súnmọ́ r.t.) |
16.69 g·cm−3 |
| Liquid density at m.p. |
15 g·cm−3 |
| ojúàmì ìyọ́ |
3290 K, 3017 °C, 5463 °F |
| ajúàmì ìhó |
5731 K, 5458 °C, 9856 °F |
| Heat of fusion |
36.57 kJ·mol−1 |
| Heat of vaporization |
732.8 kJ·mol−1 |
| Specific heat capacity |
(25 °C) 25.36 J·mol−1·K−1 |
| Vapor pressure |
| P/Pa |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T/K |
3297 |
3597 |
3957 |
4395 |
4939 |
5634 |
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| Atomic properties |
| Oxidation states |
5, 4, 3, 2, -1 (mildly acidic oxide) |
| Electronegativity |
1.5 (Pauling scale) |
| Ionization energies |
1st: 761 kJ·mol−1 |
| 2nd: 1500 kJ·mol−1 |
| Atomic radius |
146 pm |
| Covalent radius |
170±8 pm |
| Miscellanea |
| Crystal structure |
body-centered cubic |
| Magnetic ordering |
paramagnetic[1] |
| Electrical resistivity |
(20 °C) 131 nΩ·m |
| Thermal conductivity |
(300 K) 57.5 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 6.3 µm·m−1·K−1 |
| Speed of sound (thin rod) |
(20 °C) 3400 m/s |
| Young's modulus |
186 GPa |
| Shear modulus |
69 GPa |
| Bulk modulus |
200 GPa |
| Poisson ratio |
0.34 |
| Mohs hardness |
6.5 |
| Vickers hardness |
873 MPa |
| Brinell hardness |
800 MPa |
| CAS registry number |
7440-25-7 |
| Most stable isotopes |
| Main article: Isotopes of tantalum |
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