Final answer:
The copper isotope with a mass number of 64 and atomic number of 29, written as 6429Cu, has 29 protons, 35 neutrons, and 29 electrons.
Step-by-step explanation:
The student has asked to find the number of protons, neutrons, and electrons in 6429Cu. The chemical symbol for copper is Cu, and this particular isotope has a mass number of 64 and an atomic number of 29. The atomic number (29) is the number of protons and, because copper atoms are electrically neutral, also the number of electrons. The mass number (64) is the sum of protons and neutrons. Hence, to find the number of neutrons, subtract the atomic number from the mass number: 64 (mass number) - 29 (atomic number) = 35 neutrons.
In summary, 6429Cu contains:
29 protons
35 neutrons
29 electrons