  The mass number (total number of protons and neutrons) of copper is 64 and the atomic number (number of protons) of copper is 29. The number of electrons is the same as â¦ the number of protons. So if the number of protons is 29, then so is the number of electrons. The mass number (total number of protons and neutrons) of copper is 64 and the atomic number (number of protons) of copper is 29. The number of electrons is the same as â¦ the number of protons. So if the number of protons is 29, then so is the number of electrons.
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