We can know the stability of an isotope depending on the ratio of neutrons to protons but these criteria changes depending on the number of protons it has. We have listed below the ranges for the number of protons (Z) and the corresponding ratio (N/Z, where N is the number of neutrons) where the isotope would be most stable. The actual ratio doesn't have to be exact. It just has to be near the ideal ratio.
Now we go through each choice. We are going to use the notation below to write the isotopes:
Which of the following isotopes would you expect to be stable?
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