Which of the following is a result of a nuclear decay process?

The correct choice highlights key characteristics of nuclear decay processes, which involve the transformation of an unstable atomic nucleus into a more stable one. During this process, a nucleus releases energy in the form of radiation, such as alpha particles, beta particles, or gamma rays. This emission results in the rearrangement of atomic structures, as the nucleus changes its identity, potentially transforming into a different element or isotope. This fundamental change distinguishes nuclear decay from other chemical reactions, where atomic identities remain constant.

In contrast, the other options do not accurately reflect the properties of nuclear decay. Physical property changes alone without mass impact does not encompass the essential radiation emissions. An alteration in chemical composition of a stable isotope does not specifically address the instability inherent to nuclear decay since stable isotopes do not undergo this process. Finally, stating that there is no change to the original nucleus directly contradicts the nature of nuclear decay, which is inherently about a change occurring within the nucleus. Thus, the emission of radiation and rearrangement of atomic structures accurately captures the essence and consequence of a nuclear decay process.