Which of the following isotopes is the least stable? A).⁷Be,5.37 MeV/nucleon B).²³Na,8.11 MeV/nucleon C).⁹⁴Zr,8.67 MeV/nucleon D).²⁴⁰Pu,7.26 MeV/nucleon

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The stability of an isotope is generally indicated by its binding energy per nucleon, with higher values suggesting greater stability. Among the given options, the isotope with the lowest binding energy per nucleon (5.37 MeV/nucleon) is the least stable, which is option A.

Which of the Following Isotopes Is the Least Stable