Iridium was discovered by Smithson Tennant in London, England in 1803.
Name: Iridium
Symbol: Ir
Atomic number: 77
Atomic weight: 192.22
State: solid
Group, period, block: 9, 6, d
Color: silvery white
Classification: transition metal
Electron configuration: 4f14 5d7 6s2
2,8,18,32,15,2
Physical properties
Density: 22.56 g/cm-3
Melting point: 2739 K, 2466 °C, 4471 °F
Boiling point: 4701 K, 4428 °C, 8002 °F
Atomic properties
Oxidation states: 3, -1, 0, 1, 2, 3, 4, 5, 6
Electronegativity: 2.20 (Pauling scale)
Ionization energies: 1st: 880 kJ·mol-1
Covalent radius: 141±6 pm
Van der Waals radius: no data
- Ir
Electron Configuration
Isotopes
There are two naturally occurring isotopes of iridium exist, 191Ir, and 193Ir.