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How many quarks are in a proton? How many quarks are in a neutron? Protons and neutrons each contain three quarks. A proton is composed of two 'Up' quarks and one 'Down' quark while neutrons are composed of one 'Up' quark and two 'Down' quarks. Author: Steve Gagnon, Science Education Specialist (Other answers by Steve Gagnon) Related Pages: All About Atoms
Figure 1 would suggest that the up and down quarks are simply 1/3 of the mass of the proton and of the neutron: about 0.313 GeV/c2, or maybe a bit more or less due to the energy needed to hold the quarks together in the proton.