Molecule - GCSE Physics Definition
Reviewed by: Caroline Carroll
Published
A molecule is the smallest particle of a substance that retains all the chemical properties of that substance. It is made up of two or more atoms bonded together. Atoms are tiny units that form everything around us, and different combinations of atoms make up different molecules. For example, a water molecule consists of two hydrogen atoms and one oxygen atom bonded together. Molecules can be simple, like oxygen which consists of just two oxygen atoms, or complex, like proteins that contain thousands of atoms. Understanding molecules helps us to learn how substances interact and change in chemical reactions.
Examiner-written GCSE Physics revision resources that improve your grades 2x
- Written by expert teachers and examiners
- Aligned to exam specifications
- Everything you need to know, and nothing you don’t
Share this article
written revision resources that improve your