Nuclei differ in their stability, and some are so unstable that they undergo radioactive decay. The ratio of the number of neutrons to number of protons (N/Z) in a nucleus correlates with its stability. Calculate the N/Z ratio for:
(e) The radioactive isotope ²³⁸U decays in a series of nuclear reactions that includes another uranium isotope, ²³⁴U, and three lead isotopes, ²¹⁴Pb, ²¹⁰Pb, and ²⁰⁶Pb. How many neutrons, protons, and electrons are in each of these five isotopes?