Arsenic
As74.92159 g/mol Calculated
Also called As.
The classic poison of Victorian detective fiction, once in green wallpaper and patent medicines, and still a contaminant of groundwater in South Asia. Element 33.
Sources and notes
- The introductionfrom sourceMoleculeFinder curated
- Other namesfrom sourceWikidataIts English label and aliases on Wikidata.
- 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
- As
- Molecular weight
- 74.92159 g/mol
Measured LD50, HSDB via PubChem
763 mg/kg pure arsenic, rat, oral
An LD50 is an animal study measurement, not a dose for a person.
Reported Hazard label (GHS), ECHA, EU CLP Regulation, Safe Work Australia via PubChem
Danger Corrosive pictogram (GHS05), Toxic pictogram (GHS06), Irritant pictogram (GHS07), Health hazard pictogram (GHS08) and Environmental pictogram (GHS09); hazard statements H301, H315, H318, H331, H341, H350, H373, H400, H410
Groups it belongs to
- Category
- Element & material
- Family
- Chemical elements
- Hazard classes
- Corrosive, Acutely toxic, Irritant, Health hazard, Environmental hazard, GHS Danger
- Size
- Under 100 g/mol
SMILES
[As]PubChem CID 5359596 · Wikidata Q871 · InChIKey RQNWIZPPADIBDY-UHFFFAOYSA-N · Data refreshed
Questions
- What is Arsenic?
- The classic poison of Victorian detective fiction, once in green wallpaper and patent medicines, and still a contaminant of groundwater in South Asia. Element 33.
- How toxic is Arsenic?
- The reported LD50 of Arsenic is 763 mg/kg (rat, oral). An LD50 is an animal study measurement, not a dose for a person. Its GHS hazard label carries the signal word Danger and the hazard pictograms Corrosive, Toxic, Irritant, Health hazard and Environmental. from sourcefrom source
- What kind of molecule is Arsenic?
- Arsenic has the formula As and a molecular weight of 74.922 g/mol. MoleculeFinder files it under chemical elements, in the element & material group. from sourcefrom sourcefrom sourcefrom source
- What else is Arsenic called?
- Arsenic is also called As. from source
Sources and notes
- Calculated valuescomputedPubChemComputed from the structure, so no laboratory conditions apply; complexity is PubChem's own structural score.
- LD50from sourceHSDB via PubChemOther values the sources report: mouse, oral, 145 mg/kg; mouse, another route, 46.2 mg/kg. The page shows the one LD50 the site uses everywhere.
- Hazard labelfrom sourceECHA, EU CLP Regulation, Safe Work Australia via PubChemThe label combines these classifications.
- ECHAfrom sourceAttributionSource: European Chemicals Agency, echa.europa.eu.
- EU CLP Regulationfrom sourceAttributionSource: EUR-Lex, Regulation (EC) No 1272/2008, © European Union.
- Safe Work Australiafrom sourceAttributionSource: Safe Work Australia, Hazardous Chemical Information System, © Commonwealth of Australia, CC BY 4.0.
- Data refreshedfrom sourceMoleculeFinder2026-11-09