Chemicals and Drugs

Actinium

A trivalent radioactive element and the prototypical member of the actinide family. It has the atomic symbol Ac, and atomic number 89. Its principal isotope is 227 and it decays primarily by beta-emission.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

A trivalent radioactive element and the prototypical member of the actinide family. It has the atomic symbol Ac, and atomic number 89. Its principal isotope is 227 and it decays primarily by beta-emission.

Chemical Identity

Chemical Information

Molecular Formula
Ac
Molecular Weight
227.02775 g/mol
CAS Registry No.
7440-34-8
IUPAC Name
actinium
InChIKey
QQINRWTZWGJFDB-UHFFFAOYSA-N
SMILES
[Ac]
MeSH Unique ID
D000186
Source
PubChem CID 23965

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.033w
  2. D01w.268w.556w.025w
  3. D01w.496w.749.305w.100w.033w
  4. D01w.552w.020w.042w
  5. D01w.552w.544w.025w

AMA Style

References

  1. National Library of Medicine. Actinium. Medical Subject Headings (MeSH). 2026. Unique ID D000186. http://id.nlm.nih.gov/mesh/2026/D000186
  2. Actinium. In: Wikipedia. https://en.wikipedia.org/wiki/Actinium
  3. Actinium. In: Wikidata. https://www.wikidata.org/wiki/Q1121
  4. Actinium. In: PubChem Compound. CID 23965. https://pubchem.ncbi.nlm.nih.gov/compound/23965