Protactinium
Pa231.03588 g/mol Calculated
Also called brevium and Pa.
One of the rarest naturally occurring elements, a radioactive metal that exists mainly as a step in uranium's decay. Element 91.
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
- Pa
- Molecular weight
- 231.03588 g/mol
Groups it belongs to
- Category
- Element & material
- Family
- Chemical elements
SMILES
[Pa]PubChem CID 23945 · Wikidata Q1109 · InChIKey XLROVYAPLOFLNU-UHFFFAOYSA-N · Data refreshed
Questions
- What is Protactinium?
- One of the rarest naturally occurring elements, a radioactive metal that exists mainly as a step in uranium's decay. Element 91.
- What kind of molecule is Protactinium?
- Protactinium has the formula Pa and a molecular weight of 231.036 g/mol. MoleculeFinder files it under chemical elements, in the element & material group. from sourcefrom sourcefrom sourcefrom source
- What else is Protactinium called?
- Protactinium is also called brevium and Pa. from source
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