Question: who came up with the initial concept of protons and neutrons?
Evidence: Discovery of Electrons, Protons and Neutrons Discoverer Charge Proton E. Rutherford +1.6×10−19 C Neutron James Chadwick 0 Electron J.J. Thomson −1.6×10−19 C
Answer: Dmitri Ivanenko
Werner Heisenberg