| From Wikipedia, the free encyclopediaOsmium (from Greek osme (ὀσμή) meaning "smell") is a chemical element with symbol Os and atomic number 76. It is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3. | |||||
Osmium in the periodic table | |||||
|---|---|---|---|---|---|
| Symbol | Os | ||||
| Atomic number | 76 | ||||
| Group | 8 | ||||
| Period | 6 | ||||
| Block | d | ||||
| Element category | Transition Metal | ||||
Physical properties | |||||
| Phase at STP | Solid | ||||
| Density | 22.59 g/cm3 | ||||
| Atomic weight | 190.233 u | ||||
| Melting point | 3306 K 3032.85 °C 5491.13 °F | ||||
| Boiling point | 5285 K 5011.85 °C 9053.33 °F | ||||
Atomära egenskaper | |||||
| Electronegativity (Pauling Scale) | 2.2 | ||||
| Electron affinity | 103.99 kJ/mol | ||||
| Ionization energies |
| ||||
Electron configuration | |||||
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d6 6s2 | ||||
| Electrons per shell | 2, 8, 18, 32, 14, 2 | ||||
History | |||||
| Discovered | 1803 | ||||
| Discovered by | Smithson Tennant | ||||