I want to know the answer to the following question:
Name another example of a heavy isotope.
All the background I'm provided with is that "Familiar examples of such processes include nuclear decay, in which energy is released that was originally "stored" in heavy isotopes (such as uranium and thorium), by nucleosynthesis, a process ultimately using the gravitational potential energy released from the gravitational collapse of supernovae, to store energy in the creation of these heavy elements before they were incorporated into the solar system and the Earth.". Is that enough to answer the question?
Answer: yes