Iridium is a transition metal from the periodic table. It is a grayish-white, brittle metal which is relatively rare in nature. Iridium has a wide range of industrial applications, including the production of alloys, electrodes, electrical contacts and thermocouples. It is also used to make jewelry and as a catalyst in some chemical reactions.
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| Atomic number | 77 |
| Group | VIIIB |
| Period | 6 |
| Mass | 192.217 |
| Latin name | Iridium |
| Electron configuration | [Xe]4f14 5d7 6s2 |
| Oxidation state | -3, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 |