| Iridium ✕ | |
|---|---|
| Symbol | Ir |
| Atomic number | 77 |
| Chemical property | Transition metal |
| Origin o the name | Iris, the Greek goddess of the rainbow |
| Group | 9 |
| Period | 6 |
| Atomic weight (u) | 192.217 |
| Atomic weight uncertainty (u) | 0.003 |
| Density (g/cm³) | 22.56 |
| Melting point (K) | 2719 |
| Boiling point (K) | 4701 |
| Heat capacity (J/(g·K)) | 0.131 |
| Electro-negativity | 2.2 |
| Abundance in earth's crust (mg/kg) | 0.001 |