Periodic Table of the Elements: Iridium
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| Atomic Number: | 77 |
| Atomic Symbol: | Ir |
| Iridiumiridium , metallic chemical element; symbol Ir; at. no. 77; at. wt. 192.217; m.p. about 2,410°C;; b.p. about 4,130°C;; sp. gr. 22.55 at 20°C;; valence +3 or +4. ..... Click the link for more information. | |
| Atomic Weight: | 192.217 |
| Electron Configuration: | 2 · 8 · 18 32 · 15 · 2 |