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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? 3, 6, 12, 18?
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OpenStudy (anonymous):
each proton and neutron made by three quarks. helium has 2 proton and 2 neutron finally it has 12 quark.
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