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Platinum
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Pt | 78 | 195.084 | 1768.3 °C | 3825 °C | Solid | 21.45 g/cm3 | Noble Metal |
|
|
|
| General |
| Name, Symbol, Number |
platinum, Pt, 78 |
| Chemical series |
transition metals |
| Group, Period, Block |
10, 6, d |
| Appearance |
grayish white
 |
| Standard atomic weight |
195.084(9) g·mol−1 |
| Electron configuration |
[Xe] 4f14 5d9 6s1 |
| Electrons per shell |
2, 8, 18, 32, 17, 1 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
21.45 g·cm−3 |
| Liquid density at m.p. |
19.77 g·cm−3 |
| Melting point |
2041.4 K
(1768.3 °C, 3214.9 °F) |
| Boiling point |
4098 K
(3825 °C, 6917 °F) |
| Heat of fusion |
22.17 kJ·mol−1 |
| Heat of vaporization |
469 kJ·mol−1 |
| 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 |
|
| Atomic properties |
| Crystal structure |
cubic face centered |
| Oxidation states |
1, 2, 3, 4, 5, 6
(mildly basic oxide) |
| Electronegativity |
2.28 (scale Pauling) |
| Ionization energies |
1st: 870 kJ/mol |
| 2nd: 1791 kJ/mol |
| Atomic radius |
135 pm |
| Atomic radius (calc.) |
177 pm |
| Covalent radius |
128 pm |
| Van der Waals radius |
175 pm |
| Miscellaneous |
| Magnetic ordering |
paramagnetic |
| Electrical resistivity |
(20 °C) 105 n Ω·m |
| Thermal conductivity |
(300 K) 71.6 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 8.8 µm·m−1·K−1 |
| Speed of sound (thin rod) |
(r.t.) 2800 m·s−1 |
| 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 |
| Selected isotopes |
|
|
| References |
|
Platinum Compounds
|
Source: Wikipedia article Platinum
|
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Chemistry Quick Facts
