Proton

Subatomic particle with a positive electric charge found in the nucleus of an atom.

p+ H+

A proton is a subatomic particle with a positive electric charge (+1e). It resides within the nucleus of an atom and, along with neutrons, determines the atomic number and therefore the element's identity. Protons have a mass approximately 1836 times that of an electron.

/ˈproʊtɒn/

The word 'proton' comes from the Greek word 'protos,' meaning 'first.'

A proton is a tiny part of an atom, like a building block, and it has a positive electrical charge.

subatomic particle baryon

atom nucleus

fundamental particle subatomic particle