Proton
۱ × 10-15 m
Protons are found within an atom's nucleus. They are thousands of times smaller than the atom itself. They have two up quarks and one down quark. Therefore, the proton's charge is +2/3+2/3-1/3 = +1. ",

۱ × 10-15 m
Protons are found within an atom's nucleus. They are thousands of times smaller than the atom itself. They have two up quarks and one down quark. Therefore, the proton's charge is +2/3+2/3-1/3 = +1. ",
