The nucleus that has been least likely to undergo radioactive decay is the one with the highest total binding energy. Thus, option A is correct.
Radioactive decay can be given as the process of emission of radiation by unstable nuclei. The process forms the emission of different types of radiation alpha, beta, gamma, and others.
Not all nuclei are stable, unstable nuclei have too many protons or neutrons that disturb the strong nuclear forces. So they are trying to balance themselves by giving off excess protons or neutrons, this phenomenon is known as radioactive decay.
Unstable nuclei are radioactive and emit radiation due to the lowest binding energy per nucleon.
Therefore, nucleus that has the highest total binding energy would be least likely to undergo radioactive decay. Thus, option A is correct.
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