Proton

A proton belongs to the hadron family of particles. It is composed of two up quarks and one down quark, thus is a baryon. The charge on a proton is the same magnitude as that of an electron but is positive. The rest mass of a proton is 1.6726 × 10-27kg, about 1836 &times that of the electron. Hydrogen nuclei are protons. The antiparticle of a proton is the antiproton.