Chemicals and Drugs

Protactinium

A radioactive element of the actinide group of metals. It has the atomic symbol Pa, atomic number 91, and atomic weight 231. It decays by alpha-emission.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

A radioactive element of the actinide group of metals. It has the atomic symbol Pa, atomic number 91, and atomic weight 231. It decays by alpha-emission.

Chemical Identity

Chemical Information

Molecular Formula
Pa
Molecular Weight
231.03588 g/mol
CAS Registry No.
7440-13-3
IUPAC Name
protactinium
InChIKey
XLROVYAPLOFLNU-UHFFFAOYSA-N
SMILES
[Pa]
MeSH Unique ID
D011478
Source
PubChem CID 23945

MeSH Record

Classification

Broader headings

Related Concepts

Knowledge Graph

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MeSH Record

Aspects Covered

19 allowable subheadings

Indexed with the subheadings administration & dosage, adverse effects, analysis, blood, cerebrospinal fluid, chemistry, classification, economics, history, isolation & purification, metabolism, pharmacokinetics, pharmacology, poisoning, standards, supply & distribution, therapeutic use, toxicity, urine.

MeSH Hierarchy

Tree Numbers

  1. D01w.268w.271w.100w.725w
  2. D01w.268w.556w.750w
  3. D01w.496w.749.305w.100w.725w
  4. D01w.552w.020w.778w
  5. D01w.552w.544w.750w

AMA Style

References

  1. National Library of Medicine. Protactinium. Medical Subject Headings (MeSH). 2026. Unique ID D011478. http://id.nlm.nih.gov/mesh/2026/D011478
  2. Protactinium. In: Wikipedia. https://en.wikipedia.org/wiki/Protactinium
  3. Protactinium. In: Wikidata. https://www.wikidata.org/wiki/Q1109
  4. Protactinium. In: PubChem Compound. CID 23945. https://pubchem.ncbi.nlm.nih.gov/compound/23945