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.