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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.


Steve Gagnon, Science Education Specialist (Other answers by Steve Gagnon)

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