78Pt195.08
Platinum (Pt)
Element 78 · Transition metal
Platinum (Pt) is a chemical element with atomic number 78. It is classified as a transition metal in period 6, group 10 of the periodic table (the d-block). Its standard atomic weight is 195.08 u and its ground-state electron configuration is [Xe] 4f¹⁴ 5d⁹ 6s¹.
Platinum facts
| Atomic number (Z) | 78 |
|---|---|
| Symbol | Pt |
| Standard atomic weight | 195.08 u |
| Category | Transition metal |
| Group | 10 |
| Period | 6 |
| Block | d-block |
| Electron configuration | [Xe] 4f¹⁴ 5d⁹ 6s¹ |
| Electronegativity (Pauling) | 2.28 |
| State at 20 °C | Solid |
| Protons / electrons | 78 / 78 |
| Neutrons (most common isotope, approx.) | 117 |
| Molar mass | 195.08 g/mol |