Platinum |
| Symbol | Pt |
|---|---|
| Latin name | Platinium |
| Atomic number | 78 |
| Period | 6 |
| Element category | Transition elements |
| Relative atomic mass | 195.08 |
| Group | VIII.B |
| Electronegativity | 2.2 |
| Oxidation numbers | 2, 4, 6 |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d9 6s1 |
| Density [g/cm3] | 21.45 |
| State | Solid |
| Melting point [°C] | 1772 |
| Boiling point [°C] | 3827 |
| Atomic radius [pm] | 177 |
| Covalent radius [pm] | 128 |
| Thermal conductivity [W m-1K-1] | 71.6 |
| Heat capacity [J K-1g-1] | 0.13 |
| Discovery | 1735 |
| Hardness [Mohs scale] | 4.3 |
| Vickers hardness [MPa] | 549 |
| Brinell hardness [MPa] | 392 |
| Young's modulus [GPa] | 168 |
| Electrical conductivity [S m-1] | 9.4 · 106 |
| Electrical resistivity [10-6Ω.m] | 0.106 |
| Shear modulus [GPa] | 61 |
| 1.st ionization energy [eV] | 9.0 |
| 2.nd ionization energy [eV] | 18.563 |
| Stable isotopes | 6 |
| Unstable isotopes | 28 |