Iridium (Ir) — Element 77: Properties & Data | Aladdin Scientific
Iridium(Ir) — Element 77
Iridium (Ir) is a transition metal with atomic number 77 and atomic mass 192.22. It has melting point 2719 K (2446 °C), boiling point 4701 K (4428 °C), density 22.42 g/cm³. It sits in group 9 and period 6 of the periodic table and was discovered in 1803.
Key facts
| Atomic mass | 192.2200 u |
|---|---|
| Electron configuration | [Xe]6s2 4f14 5d7 |
| Oxidation states | +4, +3 |
| Electronegativity (Pauling) | 2.2 |
| Atomic radius (van der Waals) | 202 pm |
| Ionization energy | 9.1 eV |
| Electron affinity | 1.565 eV |
| Melting point | 2719 K |
| Boiling point | 4701 K |
| Density | 22.42 g/cm³ |
| Standard state | Solid |
| Year discovered | 1803 |
Frequently asked questions
What is the electron configuration of iridium?
The ground-state electron configuration of iridium is [Xe]6s2 4f14 5d7.
What group and period is iridium in?
Iridium (Ir) is in group 9 and period 6 of the periodic table, classified as a transition metal.
What is the melting point of iridium?
Iridium melts at 2719 K (2446 °C).
What is the standard state of iridium?
Iridium is a solid at standard temperature and pressure.
Related elements
About this data: property values compiled from IUPAC Standard Atomic Weights (2021), the NIST Atomic Spectra Database, and PubChem. Curated by the Aladdin Scientific technical team. Last reviewed: .