| Formula / Notation | Os |
|---|---|
| CAS Number | 7440-04-2 |
| Molecular Weight | 190.23 |
| Melting Point | 3033.0 |
| Boiling Point | 5012.0 |
| Density | 22.59 |
| Solubility | Insoluble in water |
| Appearance | Hard, lustrous, blue-grey metal |
| Also Known As | Os, osmium metal |
| Category | Elements |
What is Osmium?
Osmium is a hard, lustrous, blue-grey transition metal, atomic number 76. The densest naturally occurring element (22.59 g/cm3). Osmium tetroxide (OsO4) is extremely toxic and volatile. Most osmium is used as hard alloy with platinum group metals.
Formula & Notation
IUPAC Name: Osmium
Other Names / Synonyms: Os, osmium metal
Properties & Characteristics
Physical Data
| Property | Value |
|---|---|
| Melting Point | 3033.0 |
| Boiling Point | 5012.0 |
| Density | 22.59 |
| Molecular Weight | 190.23 |
| Solubility | Insoluble in water |
| Appearance | Hard, lustrous, blue-grey metal |
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Osmium is a hard, lustrous, blue-grey transition metal, atomic number 76. The densest naturally occurring element (22.59 g/cm3). Osmium tetroxide (OsO4) is extremely toxic and volatile. Most osmium is used as hard alloy with platinum group metals.
Platinum-osmium alloys for fountain pen tips, pivots, electrical contacts (extreme hardness). Osmium tetroxide (OsO4) staining agent in electron microscopy. OsO4 as oxidant in dihydroxylation of alkenes. Historical compass needles and pivot bearings.
Osmium tetroxide (OsO4): highly toxic - IDLH 0.001 ppm, causes severe eye damage (corneal damage) and lung damage even at trace levels. Osmium metal slowly oxidises to OsO4 in air. Osmium dust: toxic fumes risk. Work with OsO4 only in fume hood with eye protection.
The formula or notation for Osmium is: Os