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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.

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

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