A 50.0-g ball of copper has a net charge of 2.00μC. What fraction of the copper's electrons has been removed? (Each copper atom has 29 protons, and copper has an atomic mass of 63.5.) Atomic Mass Unit = 1.660 × 10 27 kg/u 10.000 × 10^23 atoms 4.739 × 10^23 atoms 6.779 × 10^23 atoms 8.759 × 10^23 atoms