| Formula / Notation | Ir |
|---|---|
| CAS Number | 7439-88-5 |
| Molecular Weight | 192.22 |
| Melting Point | 2446.0 |
| Boiling Point | 4428.0 |
| Density | 22.56 |
| Solubility | Insoluble in water |
| Appearance | Hard, brittle, silvery-white metal |
| Also Known As | Ir, iridium metal |
| Category | Elements |
What is Iridium?
Iridium is a hard, brittle, silvery-white platinum group metal, atomic number 77. The most corrosion-resistant metal known. Second densest element after osmium. The Cretaceous-Paleogene (K-Pg) extinction event asteroid impact was identified by anomalous iridium layer in sediments.
Formula & Notation
IUPAC Name: Iridium
Other Names / Synonyms: Ir, iridium metal
Properties & Characteristics
Physical Data
| Property | Value |
|---|---|
| Melting Point | 2446.0 |
| Boiling Point | 4428.0 |
| Density | 22.56 |
| Molecular Weight | 192.22 |
| Solubility | Insoluble in water |
| Appearance | Hard, brittle, silvery-white metal |
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Iridium is a hard, brittle, silvery-white platinum group metal, atomic number 77. The most corrosion-resistant metal known. Second densest element after osmium. The Cretaceous-Paleogene (K-Pg) extinction event asteroid impact was identified by anomalous iridium layer in sediments.
Iridium-platinum alloys for spark plug electrodes (long-life). International Prototype Kilogram (Pt-Ir alloy). Catalyst for acetic acid production (Monsanto and Cativa processes). Osmium-iridium alloy tips. Ir-192 industrial radiography source. Crucibles for extreme temperatures.
Iridium metal: low acute toxicity. Iridium compounds: moderate toxicity. Finely divided iridium dust: combustible. Ir-192: gamma-emitting industrial source - radiation hazard, strict regulatory control. IrCl3 and other compounds: irritant.
The formula or notation for Iridium is: Ir