Icon class icon_class fas fa-quote-left icon_class_computed fas fa-quote-left Related content Protons are spin-1/2 fermions and are composed of three valence quarks, making them baryons Source Wikipedia Copyright information Text from Wikipedia and Wiktionary web pages quoted for educational purposes is subject to the Wikipedia Creative Commons Attribution ShareAlike Licence Snippet kind INFO Previous snippet The two up quarks and one down quark of a proton are held together by the strong force, mediated by gluons. Full quote A modern perspective has a proton composed of the valence quarks (up, up, down), the gluons, and transitory pairs of sea quarks. URL https://en.wikipedia.org/wiki/Proton Next snippet Related snippets Protons are spin-1/2 fermions and are composed of three valence quarks, making them baryons (a sub-type of hadrons). The two up quarks and one down quark of a proton are held together by the strong force, mediated by gluons. Related snippets (backlinks) Visit also Visit also (backlinks) Flags