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OpenStudy (anonymous):
A helium atom has two protons, two neutrons, and two electrons. When quarks are present, they appear in groups of three. How many quarks does a helium atom contain?
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OpenStudy (aaronq):
Protons have 2 'up quarks and 1 'down quark', Neutrons have 1 'up quark and 2 'down quarks'. Electrons are leptons.
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