Copper neutrons
if you can split them no longer remain copper anymore. The easy chemical answer: 29 protons, 29 electrons and a varying number of neutrons as an atom in a Picture of 3d render of atom structure of copper isolated over white background Protons are represented as red spheres, neutron as yellow spheres, electrons as This Pin was discovered by Jeb McCalmont. Discover (and save!) your own Pins on Pinterest.