Atoms

The smallest units of matter that retain the properties of an element.

Articles with this tag: 2 Updated: August 23, 2026

Articles with this tag

Atom: the basic unit of matter

Atom: the basic unit of matter Atom An atom is the smallest unit of a chemical element that retains its properties. This article explains atomic structure, size, isotopes, bonding, historical development, and practic…

Chemical element A chemical element is a pure substance whose atoms share the same number of protons; elements form the periodic table and are the basic building blocks of matter and materials.