noun
- a positively charged particle found in the nucleus of an atom
Usage: physics
Examples
- Every hydrogen atom contains exactly one proton.
- The number of protons in an atom determines what element it is.
- Protons and neutrons make up the atomic nucleus.
- A proton has a positive electrical charge.
- Scientists can accelerate protons in particle accelerators.
- The proton was discovered in the early 20th century.