Proton

A stable composite particle belonging to the “hadron” family of particles, made of two up quarks and a down quark. It has a +1 electrical charge and is found in the nuclei of atoms. A proton has a mass of $\sim 938 MeV/c^2$, or about 1836 times the mass of an electron. Protons are one of the species of particles collided at the LHC.