Osmium
Os190.2 g/mol Calculated
The densest naturally occurring element, twice as heavy as lead by volume, used in fountain pen nibs and electrical contacts. Element 76.
Sources and notes
- The introductionfrom sourceMoleculeFinder curated
- Formula and weightcomputedPubChem
- 2D drawingcomputedPubChem structure, drawn by RDKit
Where you encounter it
A pure element or an engineered material, rather than an ingredient in a product.
Sources and notes
- The line abovefrom sourceMoleculeFinder curatedFrom the group the molecule belongs to.
Properties and sources
Calculated by PubChem
- Molecular formula
- Os
- Molecular weight
- 190.2 g/mol
Reported Hazard label (GHS), ECHA via PubChem
Danger Flammable pictogram (GHS02), Corrosive pictogram (GHS05) and Irritant pictogram (GHS07); hazard statements H228, H315, H318, H335, H413
Groups it belongs to
- Category
- Element & material
- Family
- Chemical elements
- Hazard classes
- Flammable, Corrosive, Irritant, GHS Danger
Questions
- What is Osmium?
- The densest naturally occurring element, twice as heavy as lead by volume, used in fountain pen nibs and electrical contacts. Element 76.
- How toxic is Osmium?
- Its GHS hazard label carries the signal word Danger and the hazard pictograms Flammable, Corrosive and Irritant. from source
- What kind of molecule is Osmium?
- Osmium has the formula Os and a molecular weight of 190.2 g/mol. MoleculeFinder files it under chemical elements, in the element & material group. from sourcefrom sourcefrom sourcefrom source
Sources and notes
- Calculated valuescomputedPubChemComputed from the structure, so no laboratory conditions apply; complexity is PubChem's own structural score.
- Hazard labelfrom sourceECHA via PubChemThe label combines these classifications.
- ECHAfrom sourceAttributionSource: European Chemicals Agency, echa.europa.eu.
- Data refreshedfrom sourceMoleculeFinder2026-11-09