The isotope 65 29cu2 + has how many electrons and how many protons?

27 electron and 29 protons

29 protons and 27 electrons. Since the element is copper, that automatically means that you have 29 protons. Any other number would be an element other than copper. The 2 + indicates that the ion has a positive charge of 2. So it is missing 2 electrons. Since a neutral atom would have 29 electrons and you're missing 2, the number of electrons will be 29 - 2 = 27 So the answer is 29 protons and 27 electrons.