78Pt195.08
Platinum
Transition Metal
Solid at STP
Period 6Group 10Block DDiscovered 1735
[Xe]6s1 4f14 5d9
Platinum is a chemical element with symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, gray-white transition metal. Its name is derived from the Spanish term platina, which is literally translated into "little silver".
📖 Read more on Wikipedia →Atomic Properties
| Atomic Number | 78 |
| Atomic Mass | 195.08 u |
| Electron Configuration | [Xe]6s1 4f14 5d9 |
| Oxidation States | +4, +2 |
| Electronegativity | 2.28 (Pauling) |
| Atomic Radius | 209 pm |
| Ionization Energy | 9 eV |
| Electron Affinity | 2.128 eV |
| Block | D |
Physical Properties
| Appearance | silvery white |
| Standard State | Solid |
| Melting Point | 2041.55 K (1768.4 °C) |
| Boiling Point | 4098 K (3824.8 °C) |
| Density | 21.46 g/cm³ |
| Molar Heat | 25.86 J/(mol·K) |
| CPK Color | #D0D0E0 |
Classification
| Category | Transition Metal |
| Group Block | Transition metal |
| Period | 6 |
| Group | 10 |
| Block | D |
Discovery
| Year Discovered | 1735 |
| Discovered By | Antonio de Ulloa |
| Electron Shells | 2, 8, 18, 32, 17, 1 |