Answer:
Step-by-step explanation:
Here, we want to get the reason why an isotope is radioactive and another is not
The reason for this is because while 1 isotope is stable, the other is not
Carbon-12 is stable and will not undergo radioactivity while the unstable carbon-14 undergoes it
This is to say that stability is an important factor when considering an atom that could be radioactive. Thus, we can say most radioactive nuclei are unstable atoms