Platinum
Lát'ọwọ́ Wikipedia, ìwé ìmọ̀ ọ̀fẹ́
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| Ìfarahàn |
grayish white
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| Àwọn ìní àníkárí |
| Orúkọ, àmì-ìdámọ̀, nọ́mbà |
platinum, Pt, 78 |
| Ẹ̀ka apilẹ̀sẹ̀ |
transition metal |
| Àdìpọ̀, ìgbà, block |
10, 6, d |
| Ìwúwo átọ́mù |
195.084 g·mol−1 |
| Ìtòjọ ẹ̀lẹ́ktrónì |
[Xe] 4f14 5d9 6s1 |
| Àwọn ẹ̀lẹ́ktrónì lórí ọ̀nà kan |
2, 8, 18, 32, 17, 1 (Image) |
| Àwọn ìní aláfójúrí |
| Phase |
solid |
| Kíki (tó súnmọ́ r.t.) |
21.45 g·cm−3 |
| Liquid density at m.p. |
19.77 g·cm−3 |
| ojúàmì ìyọ́ |
2041.4 K, 1768.3 °C, 3214.9 °F |
| ajúàmì ìhó |
4098 K, 3825 °C, 6917 °F |
| Heat of fusion |
22.17 kJ·mol−1 |
| Heat of vaporization |
469 kJ·mol−1 |
| Specific heat capacity |
(25 °C) 25.86 J·mol−1·K−1 |
| Vapor pressure |
| P/Pa |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T/K |
2330 |
(2550) |
2815 |
3143 |
3556 |
4094 |
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| Atomic properties |
| Oxidation states |
6, 5, 4, 3 , 2, 1, -1, -2
(mildly basic oxide) |
| Electronegativity |
2.28 (Pauling scale) |
| Ionization energies |
1st: 870 kJ·mol−1 |
| 2nd: 1791 kJ·mol−1 |
| Atomic radius |
139 pm |
| Covalent radius |
136±5 pm |
| Van der Waals radius |
175 pm |
| Miscellanea |
| Crystal structure |
face-centered cubic |
| Magnetic ordering |
paramagnetic |
| Electrical resistivity |
(20 °C) 105 nΩ·m |
| Thermal conductivity |
(300 K) 71.6 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 8.8 µm·m−1·K−1 |
| Tensile strength |
125-240 MPa |
| Young's modulus |
168 GPa |
| Shear modulus |
61 GPa |
| Bulk modulus |
230 GPa |
| Poisson ratio |
0.38 |
| Mohs hardness |
4–4.5 |
| Vickers hardness |
549 MPa |
| Brinell hardness |
392 MPa |
| CAS registry number |
7440-06-4 |
| Most stable isotopes |
| Main article: Isotopes of platinum |
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