3K

Proton

UK //ˈprəʊtɒn//US //ˈproʊtɑn//

Definition

A positively charged particle found in the nucleus of an atom.

In simple words: A small particle in the center of an atom with a positive charge.

Examples

Each atom contains protons in its nucleus.
Protons determine the atomic number of an element.
In hydrogen, there is one proton and one electron.
Protons have a positive charge, while electrons are negative.
A proton's mass is approximately 1,836 times that of an electron.

Usage notes

Commonly used in chemistry and physics. Appropriate in scientific contexts but may be unfamiliar to those without a science background.

Grammar pattern

standalone noun

Memory hint

Protons are positive! Think of 'pro' as in someone who's good at something.

Collocations

nuclear physics
atomic structure
proton beam

Synonyms

nucleus particle
atomic particle
positron

Common mistakes

Confused with 'neutron' which has no charge.
Incorrectly pronounced, especially not stressing the first syllable.
Used in non-scientific contexts incorrectly.