Question

what is radioactive decay? the combination of two stable nuclei the process of a stable nucleus gaining protons the process of a nucleus losing electrons the transformation of an unstable nucleus into a more stable form

Explanation:

Radioactive decay is the process by which an unstable atomic nucleus loses energy by emitting radiation, transforming into a more stable form. The other options describe different nuclear - related processes but not radioactive decay.

Answer:

The transformation of an unstable nucleus into a more stable form