Wolframu
Lát'ọwọ́ Wikipedia, ìwé ìmọ̀ ọ̀fẹ́
| Tungsten |
|
74W
|
|
|
| Ìhànsójú |
grayish white, lustrous
 |
| Àwọn ìdámọ́ wíwọ́pọ̀ |
| Orúkọ, àmì-ìdámọ́, nọ́mbà |
tungsten, W, 74 |
| Ìpèlóhùn |
/ˈtʌŋstən/; alternatively, /ˈwʊlfrəm/ WOOL-frəm |
| Ẹ̀ka ẹ́límẹ̀nti |
transition metal |
| Ẹgbẹ́, àsìkò, àdìpò |
6, 6, d |
| Ìwúwo átọ́mù |
183.84 |
| Ìtòléra ẹ̀lẹ́ktrónì |
[Xe] 4f14 5d4 6s2[1]
2, 8, 18, 32, 12, 2 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
19.25 g·cm−3 |
| Liquid density at m.p. |
17.6 g·cm−3 |
| Melting point |
3695 K, 3422 °C, 6192 °F |
| Boiling point |
5828 K, 5555 °C, 10031 °F |
| Critical point |
13892 K, MPa |
| Heat of fusion |
52.31 kJ·mol−1 |
| Heat of vaporization |
806.7 kJ·mol−1 |
| Molar heat capacity |
24.27 J·mol−1·K−1 |
| Vapor pressure |
| P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T (K) |
3477 |
3773 |
4137 |
4579 |
5127 |
5823 |
|
| Atomic properties |
| Oxidation states |
6, 5, 4, 3, 2, 1, 0, −1, -2
(mildly acidic oxide) |
| Electronegativity |
2.36 (Pauling scale) |
| Ionization energies |
1st: 770 kJ·mol−1 |
| 2nd: 1700 kJ·mol−1 |
| Atomic radius |
139 pm |
| Covalent radius |
162±7 pm |
| Miscellanea |
| Crystal structure |
body-centered cubic
|
| Magnetic ordering |
paramagnetic[2] |
| Electrical resistivity |
(20 °C) 52.8 nΩ·m |
| Thermal conductivity |
173 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 4.5 µm·m−1·K−1 |
| Young's modulus |
411 GPa |
| Shear modulus |
161 GPa |
| Bulk modulus |
310 GPa |
| Poisson ratio |
0.28 |
| Mohs hardness |
7.5 |
| Vickers hardness |
3430 MPa |
| Brinell hardness |
2570 MPa |
| CAS registry number |
7440-33-7 |
| Àwọn ísótòpù dídúró jùlọ |
| Main article: Àwọn ísótòpù tungsten |
|
|
|
· r |
