Final answer:
Unstable nuclei lack sufficient binding energy, leading to radioactive decay where they emit alpha, beta, or gamma radiation.
Explanation:
Characteristics of an unstable nucleus:
- Does not have enough binding energy: Unstable nuclei have insufficient binding energy per nucleon, making them less stable.
- Cannot hold the nucleus permanently: Unstable nuclei are prone to disintegration or radioactive decay.
- Emits alpha, beta, or gamma radiation: Unstable nuclei emit these types of radiation during decay processes.
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