Proton
Leaving Cert Chemistry · The Nature of Matter
Higher Level
A positively charged subatomic particle found in the nucleus, with a relative charge of +1 and a relative mass of 1. The number of protons in the nucleus fixes which element an atom belongs to.
Ordinary Level
A positive particle found in the nucleus of an atom. It has a relative mass of 1.
Chemistry practice is part of Pro. Reading the definitions here is always free.
More The Nature of Matter terms
Get the free study guide
H1 Owl is now on the App Store: download it for iPhone. Sign up here and get The Leaving Cert Maths Game Plan, our free PDF study guide, straight away, plus occasional study tips.
Occasional emails, no spam. Under 16? Ask a parent to sign up for you.
Where next
All Chemistry terms
The whole Leaving Cert Chemistry glossary, grouped by strand and labelled by level.
Browse ChemistryQuestion of the day
One real Higher Level Maths question, new every day, with the explanation.
Answer today'sThe app
1,700+ original questions across Maths, Biology, Chemistry and Physics. Maths is free.
See the app