Nuclei having the same mass numbers are called isobars.

Chapter 44, Problem 19

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Nuclei having the same mass numbers are called isobars. The isotope 139 57La is stable. A radioactive isobar, 139 59Pr, is located below the line of stable nuclei as shown in Figure P44.19 and decays by e1 emission. Another radioactive isobar of 139 57La, 139 55Cs, decays by e2 emission and is located above the line of stable nuclei in Figure P44.19. (a)Which of these three isobars has the highest neutron-to-proton ratio? (b) Which has the greatest binding energy per nucleon? (c) Which do you expect to be heavier, 139 59Pr or 139 55Cs?

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