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iridium (Ir)
A very hard and brittle, exceptionally corrosion-resistant, whitish-yellow metallic element. Iridium occurs in platinum ore and is used principally to harden platinum and in high-temperature materials, electrical contacts, and wear-resistant bearings. Its name comes from the Latin iris (stem irid-) for "rainbow", from the variety of colors in gives in solution.
| atomic number | 77 |
| relative atomic mass | 192.2 |
| relative density | 22.42 (at 17 °C) |
| melting point | 2,140 °C |
| boiling point | 4,527 °C |
Related category
• INORGANIC CHEMISTRY
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