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78
Pt
195.08
Platinum
Transition metals · Group 10 · Period 6
Atomic properties
| Atomic number | 78 |
|---|---|
| Symbol | Pt |
| Standard atomic weight | 195.08 |
| Classification | Transition metals |
| Group | 10 |
| Period | 6 |
| Block | d-block |
| Electron configuration | [Xe] 4f14 5d9 6s1 |
| Electronegativity (Pauling) | 2.28 |
| Common oxidation states | +4, +2 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 21.45 g/cm³ |
| Melting point | 1768.3 °C |
| Boiling point | 3825 °C |
| Discovered | 1735 |
| CAS number | — |