Osmium (Os) — Element 76: Properties & Data | Aladdin Scientific
Osmium(Os) — Element 76
Osmium (Os) is a transition metal with atomic number 76 and atomic mass 190.2. It has melting point 3306 K (3033 °C), boiling point 5285 K (5012 °C), density 22.57 g/cm³. It sits in group 8 and period 6 of the periodic table and was discovered in 1803.
Key facts
| Atomic mass | 190.2000 u |
|---|---|
| Electron configuration | [Xe]6s2 4f14 5d6 |
| Oxidation states | +4, +3 |
| Electronegativity (Pauling) | 2.2 |
| Atomic radius (van der Waals) | 216 pm |
| Ionization energy | 8.7 eV |
| Electron affinity | 1.1 eV |
| Melting point | 3306 K |
| Boiling point | 5285 K |
| Density | 22.57 g/cm³ |
| Standard state | Solid |
| Year discovered | 1803 |
Frequently asked questions
What is the electron configuration of osmium?
The ground-state electron configuration of osmium is [Xe]6s2 4f14 5d6.
What group and period is osmium in?
Osmium (Os) is in group 8 and period 6 of the periodic table, classified as a transition metal.
What is the melting point of osmium?
Osmium melts at 3306 K (3033 °C).
What is the standard state of osmium?
Osmium 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: .