76Os190.2
Osmium
Transition Metal
Solid at STP
Period 6Group 8Block DDiscovered 1803
[Xe]6s2 4f14 5d6
Osmium (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.
📖 Read more on Wikipedia →Atomic Properties
| Atomic Number | 76 |
| Atomic Mass | 190.2 u |
| Electron Configuration | [Xe]6s2 4f14 5d6 |
| Oxidation States | +4, +3 |
| Electronegativity | 2.2 (Pauling) |
| Atomic Radius | 216 pm |
| Ionization Energy | 8.7 eV |
| Electron Affinity | 1.1 eV |
| Block | D |
Physical Properties
| Appearance | silvery, blue cast |
| Standard State | Solid |
| Melting Point | 3306 K (3032.8 °C) |
| Boiling Point | 5285 K (5011.9 °C) |
| Density | 22.57 g/cm³ |
| Molar Heat | 24.7 J/(mol·K) |
| CPK Color | #266696 |
Classification
| Category | Transition Metal |
| Group Block | Transition metal |
| Period | 6 |
| Group | 8 |
| Block | D |
Discovery
| Year Discovered | 1803 |
| Discovered By | Smithson Tennant |
| Electron Shells | 2, 8, 18, 32, 14, 2 |