Iridium (Ir): Properties, Uses and Facts in 3D
Iridium is element 77 on the periodic table, a transition metal. At room temperature it is a solid. Open it in the 3D Periodic Table to spin its tile, see its electron shells and read its story.
Explore in 3DIridium quick facts
| Atomic number | 77 |
|---|---|
| Symbol | Ir |
| Atomic mass | 192.217 |
| Category | Transition Metal |
| Group and period | Group 9, period 6 |
| Block | d-block |
| State at room temperature | Solid |
| Electron configuration | [Xe] 4f¹⁴ 5d⁷ 6s² |
| Electrons per shell | 2, 8, 18, 32, 15, 2 |
| Discovered | 1804, Tennant |
What is iridium used for?
- Spark plug tips
- International Prototype Kilogram alloy (Pt-Ir)
- High-temperature crucibles & electrodes
Interesting facts about iridium
- The Cretaceous, Paleogene boundary (dinosaur extinction) is marked by an iridium-rich layer from the asteroid impact
- Iridium is the most corrosion-resistant metal. It resists even aqua regia at room temperature
- The International Prototype Kilogram is made from 90% platinum, 10% iridium
Iridium was discovered in 1804 by Tennant in Britain.
Where iridium sits on the periodic table
Iridium is in group 9, period 6. Tap any element to open its page.
Other transition metals
Iridium questions
What is the atomic number of iridium?
Iridium has atomic number 77, so every iridium atom has 77 protons in its nucleus. Its symbol is Ir and its atomic mass is 192.217.
Is iridium a metal?
Iridium is a metal. On the periodic table it is grouped as a transition metal, found in group 9, period 6.
What is the electron configuration of iridium?
The electron configuration of iridium is [Xe] 4f¹⁴ 5d⁷ 6s². Its electrons sit in 6 shells: 2, 8, 18, 32, 15, 2.
What is iridium used for?
Iridium is used for spark plug tips, international prototype kilogram alloy (pt-ir) and high-temperature crucibles & electrodes.
Who discovered iridium?
Iridium was discovered in 1804 by Tennant in Britain.
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