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The quark! A proton is made of two Up quarks and one Down quark. The Up quark has a charge +(2/3)*e and the Down quark has a charge -(1/3)*e; where 'e' is the elementary charge of the electron. Since we know that a proton has a net charge of +e it must mean that a proton is +(2/3)*e+(2/3)*e-(1/3)*e = +(4/3)*e-(1/3)*e = +(3/3)*e = +(1)*e = +e

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