Osmium
Transition Metal
Osmium (Os) is a chemical element with atomic number 76, classified as a transition metal. At room temperature it is a solid. It was discovered in 1803 by Smithson Tennant.
Properties
- Atomic number
- 76
- Atomic mass
- 190.23 u
- Category
- Transition Metal
- Group
- 8
- Period
- 6
- Block
- d-block
- Electron configuration
- [Xe] 4f¹⁴ 5d⁶ 6s²
- Phase at STP
- Solid
- Density
- 22.61 g/cm³
- Melting point
- 3306 K (3032.8 °C)
- Boiling point
- 5285 K (5011.9 °C)
- Electronegativity
- 2.2
- Atomic radius
- 185 pm
- Ionization energy
- 8.438 eV
- Discovery
- 1803 · Smithson Tennant
Common uses
Pen tips, electrical contacts, catalysts, fingerprint detection
Did you know?
Densest naturally occurring element and extremely hard.
Experiment with the elements
Osmium doesn't form any compounds in our lab yet, but the periodic table sandbox lets you combine dozens of other real elements into real compounds — water, table salt, ammonia and many more — with their true chemical formulas.