What is the result of an unstable radioisotope undergoing radioactive decay?

The result of an unstable radioisotope undergoing radioactive decay is that it becomes more stable by giving out radiation. When an unstable isotope decays, it transforms into a different form, which could be a different isotope or a completely different element altogether, depending on the type of decay taking place (such as alpha, beta, or gamma decay). This process involves the emission of radiation, which allows the nucleus to achieve a more stable configuration.

Through this emission, the total energy of the system decreases, leading to a more stable nucleus over time. It's important to understand that while the decay may also involve a transition to a different element or isotope, the primary result is the release of energy and a more stable arrangement in the process.

The notion that an unstable radioisotope might remain unchanged contradicts the very definition of radioactive decay, which is inherently about change. Similarly, while the decay process can involve the release of light and heat (especially in some cases, like gamma decay), this is not the most comprehensive or accurate result of the decay—it is rather a side effect of the energy change.