Iridium
Transition Metal
Iridium (Ir) is a chemical element with atomic number 77, classified as a transition metal. At room temperature it is a solid. It was discovered in 1803 by Smithson Tennant.
Properties
- Atomic number
- 77
- Atomic mass
- 192.22 u
- Category
- Transition Metal
- Group
- 9
- Period
- 6
- Block
- d-block
- Electron configuration
- [Xe] 4f¹⁴ 5d⁷ 6s²
- Phase at STP
- Solid
- Density
- 22.56 g/cm³
- Melting point
- 2719 K (2445.8 °C)
- Boiling point
- 4701 K (4427.9 °C)
- Electronegativity
- 2.2
- Atomic radius
- 180 pm
- Ionization energy
- 8.967 eV
- Discovery
- 1803 · Smithson Tennant
Common uses
Spark plugs, crucibles, jewelry, anticancer drugs
Did you know?
Most corrosion-resistant element and linked to dinosaur extinction.