Chapter 30, Problem 13P

(a)

To determine

The radioactive isobars having the highest neutron-to-proton ratio among ${}_{57}^{139}\text{La}$, ${}_{59}^{139}\text{Pr}$ and ${}_{55}^{139}\text{Cs}$.

(b)

To determine

The greatest binding energy per nucleon among ${}_{57}^{139}\text{La}$, ${}_{59}^{139}\text{Pr}$ and ${}_{55}^{139}\text{Cs}$.

(c)

To determine

The heavier radioactive isotope among ${}_{59}^{139}\text{Pr}$ and ${}_{55}^{139}\text{Cs}$.