Chemicals and Drugs

Ions

An atom or group of atoms that have a positive or negative electric charge due to a gain (negative charge) or loss (positive charge) of one or more electrons. Atoms with a positive charge are known as CATIONS; those with a negative charge are ANIONS.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

An atom or group of atoms that have a positive or negative electric charge due to a gain (negative charge) or loss (positive charge) of one or more electrons. Atoms with a positive charge are known as CATIONS; those with a negative charge are ANIONS.

MeSH Record

Classification

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MeSH Record

Aspects Covered

24 allowable subheadings

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

MeSH Record

Indexing Annotation

general or unspecified; prefer specifics; ionization chamber: index under RADIOMETRY /instrum

MeSH Hierarchy

Tree Number

  1. D01w.248w.497w

AMA Style

References

  1. National Library of Medicine. Ions. Medical Subject Headings (MeSH). 2026. Unique ID D007477. http://id.nlm.nih.gov/mesh/2026/D007477
  2. Ions. In: Wikipedia. https://en.wikipedia.org/wiki/Ion
  3. Ions. In: Wikidata. https://www.wikidata.org/wiki/Q36496