| From Wikipedia, the free encyclopediaPlatinum 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". | |||||
Platinum in the periodic table | |||||
|---|---|---|---|---|---|
| Symbol | Pt | ||||
| Atomic number | 78 | ||||
| Group | 10 | ||||
| Period | 6 | ||||
| Block | d | ||||
| Element category | Transition Metal | ||||
Physical properties | |||||
| Phase at STP | Solid | ||||
| Density | 21.45 g/cm3 | ||||
| Atomic weight | 195.085 u | ||||
| Melting point | 2041.4 K 1768.25 °C 3214.85 °F | ||||
| Boiling point | 4098 K 3824.85 °C 6916.73 °F | ||||
Atomära egenskaper | |||||
| Electronegativity (Pauling Scale) | 2.28 | ||||
| Electron affinity | 205.041 kJ/mol | ||||
| Ionization energies |
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Electron configuration | |||||
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d9 6s1 | ||||
| Electrons per shell | 2, 8, 18, 32, 17, 1 | ||||
History | |||||
| Discovered | 1735 | ||||
| Discovered by | Antonio de Ulloa | ||||