Why is radioactive decay considered a random process?

The correct answer is B: It cannot be predicted when an individual nucleus will decay.

The correct answer is B: It cannot be predicted when an individual nucleus will decay. This supports the learning objective "Define radioactive decay as the process in which an unstable nucleus emits radiation." in Radioactive decay and nuclear radiation because it uses the correct atomic and nuclear radiation relationship for Atoms and nuclear radiation. The other options are less suitable because they do not match the required Radioactive decay and nuclear radiation idea: It occurs at a predictable rate for all isotopes; It always results in the emission of the same type of radiation; It can be controlled by external factors.