Iridium
transition metal
Properties
- Atomic number
- 77
- Atomic mass
- 192.217 u
- Category
- transition metal
- Group
- 9
- Period
- 6
- Block
- d-block
- State (room temp)
- Solid
- Outer-shell electrons
- 2
- Electronegativity
- 2.2 (Pauling)
- Density
- 22.56 g/cm³
- Melting point
- 2445.85 °C
- Boiling point
- 4129.85 °C
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d⁷
Noble-gas shorthand: [Xe] 4f¹⁴ 5d⁷ 6s²
Electrons per shell: 2, 8, 18, 32, 15, 2 — that's 2 in the outermost shell.
About Iridium
Iridium is a chemical element with symbol Ir and atomic number 77. A very hard, brittle, silvery-white transition metal of the platinum group, iridium is generally credited with being the second densest element (after osmium) based on measured density, although calculations involving the space lattices of the elements show that iridium is denser. It is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C. Although only certain molten salts and halogens are corrosive to solid iridium, finely divided iridium dust is much more reactive and can be flammable.
- Discovered by Smithson Tennant
- Appearance: silvery white
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.