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atom

Smallest unit of a chemical element

EntityQ9121

Also known as atom of element

Subclass of: chemical entity
1
Sources
1.Stated in ChEBI
View statement on Wikidata ↗
, composite particle
Part of: molecule

Overview

From Wikipedia, the free encyclopedia · Read full article · Text CC BY-SA 4.0

Atoms are the basic particles of the chemical elements and the fundamental building blocks of matter. An atom consists of a nucleus of protons and generally neutrons, surrounded by an electromagnetically bound swarm of electrons. The chemical elements are distinguished from each other by the number of protons that are in their atoms. For example, any atom that contains 11 protons is sodium, and any atom that contains 29 protons is copper. Atoms with the same number of protons but a different number of neutrons are called isotopes of the same element.

Overview

All data

94 statements · 14% with external sources · numbers in brackets are citations

On other databases

62 identifiers linking atom across the web's reference databases

Data quality

statements

14%

externally sourced

Source last edited October 9, 2026. AIDB refreshes this page daily.

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AIDB. (2026). atom (Q9121). Retrieved from https://aidb.si/e/atom-Q9121