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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
The name for these composite particles is hadrons. Quarks, like protons and electrons, have electric charge. However, their electric charges are fractional charges, either 2/3 or -1/3 (-2/3 and 1/3 for antiquarks), and they always arrange to form particles with an integer charge (ie.-1, 0, 1, 2...).he proton is composed of two up quarks and one down quark. As you can see, when the charges from the individual quarks are added up, you arrive at the familiar charge of +1 for the proton. The neutron is made up of two down quarks and one up quark.