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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?

OpenStudy (anonymous):

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OpenStudy (anonymous):

A proton is made up of 2 up quarks and 1 down quark. => 3 quarks A neutron is made up of 1 up quark and 2 down quarks. => 3 quarks Helium has 2 protons and 2 neutrons => 2.3 + 2.3 = 12 quarks

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