Ir
Iridium
Element 77 · Transition metal · Period 6, Group 9
Solid · Discovered 1803
Atomic Properties
| Atomic Number | 77 |
| Atomic Mass | 192.22u |
| Electron Configuration | [Xe]6s2 4f14 5d7 |
| Electronegativity | 2.2Pauling |
| Atomic Radius | 202pm |
| Ionization Energy | 9.1eV |
| Electron Affinity | 1.565eV |
| Oxidation States | +4, +3 |
Physical Properties
| Standard State | Solid |
| Melting Point | 2719K |
| Boiling Point | 4701K |
| Density | 22.42g/cm³ |
| Group Block | Transition metal |
| Year Discovered | 1803 |