Ir
Iridium Symbol (Ir)
Iridium is element 77 of the periodic table. Copy its symbol Ir and see its atomic weight, electron configuration and physical properties.
What does Ir mean?
Ir is the chemical symbol for iridium, element number 77 in the periodic table. Iridium is a transition metal in group 9, period 6. It is a solid at room temperature and was discovered in 1803.
Codes and properties
| Chemical symbol | Ir |
|---|---|
| Atomic number (Z) | 77 |
| Atomic weight (PubChem) | 192.22 |
| Group / period | 9 / 6 |
| Element category | transition metal |
| Electron configuration | [Xe]6s² 4f¹⁴ 5d⁷ |
| State at 20 °C | Solid |
| Oxidation states | +4, +3 |
| Electronegativity (Pauling) | 2.2 |
| Melting point | 2719 K (2445.85 °C) |
| Boiling point | 4701 K (4427.85 °C) |
| Density | 22.42 g/cm³ |
| Discovered | 1803 |
How to type Ir
- Plain text: type
Ir— element symbols are ordinary Latin letters, with the first letter capitalised and the second lowercase. - Subscripts in formulas: use Unicode subscript digits (₀₁₂₃₄₅₆₇₈₉) for formulas such as H₂O — copy them from the chemistry keyboard.
- LaTeX: write
\mathrm{Ir}in math mode, or use the mhchem package:\ce{Ir}. - HTML:
Ir; for subscripts use<sub>, e.g.H<sub>2</sub>O.
Frequently asked questions
What is the chemical symbol for iridium?
The chemical symbol for iridium is Ir.
What is the atomic number of iridium?
Iridium has atomic number 77, meaning each atom has 77 protons.
What is the electron configuration of iridium?
The ground-state electron configuration of iridium is [Xe]6s² 4f¹⁴ 5d⁷.
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Reference: Iridium on PubChem (NIH)