Astatine
At209.98715 g/mol Calculated
Also called astato and Element-At.
The rarest naturally occurring element on earth: less than a teaspoon exists in the whole crust at any moment, and every atom decays within hours. Element 85.
Sources and notes
- The introductionfrom sourceMoleculeFinder curated
- Other namesfrom sourcePubChem / 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
- At
- Molecular weight
- 209.98715 g/mol
Groups it belongs to
- Category
- Element & material
- Family
- Chemical elements
SMILES
[At]PubChem CID 5460479 · Wikidata Q999 · InChIKey RYXHOMYVWAEKHL-UHFFFAOYSA-N · Data refreshed
Questions
- What is Astatine?
- The rarest naturally occurring element on earth: less than a teaspoon exists in the whole crust at any moment, and every atom decays within hours. Element 85.
Sources and notes
- Calculated valuescomputedPubChemComputed from the structure, so no laboratory conditions apply; complexity is PubChem's own structural score.
- Data refreshedfrom sourceMoleculeFinder2026-11-09