P

Protactinium

Expert Written | Fact Checked | Sources Cited | AllChemicals Editorial Team
Quick Reference
Formula / NotationPa
Molecular Weight231.04
CategoryElements

What is Protactinium?

Protactinium is a rare, highly toxic and radioactive actinide metal. Its name means 'parent of actinium' as it decays into actinium. It is one of the rarest and most expensive naturally occurring elements.

Formula & Notation

Pa

Properties & Characteristics

Appearance: silvery metallic. Melting point: 1568 °C. Boiling point: 4027 °C. Density: 15.37 g/cm³.

Uses & Applications

No practical commercial uses. Used in small quantities for scientific research, particularly in geochronology for uranium-thorium-protactinium dating of marine sediments.

Safety Information

Highly radioactive and toxic. Alpha emitter. Accumulates in kidneys and bones. Extreme hazard; handled only in specialist facilities.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Protactinium
Formula Pa
Molecular Weight 231.04
Category Elements

Frequently Asked Questions

Protactinium is a rare, highly toxic and radioactive actinide metal. Its name means 'parent of actinium' as it decays into actinium. It is one of the rarest and most expensive naturally occurring elements.

More "P" Terms

View all "P" terms →
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Editorial standards: Chemical data is sourced from peer-reviewed literature, CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA, and IAEA. For educational purposes only — always consult official SDS documentation and qualified professionals before handling chemicals.