2. Disintegration of unstable nucleus also known as decay.
3. The process is said to be spontaneous because it is not triggered by any external factors like temperature and pressure.
4. Which and when the nucleus will decay is unpredictable and uncontrollable. That's why this process is a random process.
5. There are three types of radioactive emission. They are alpha particle, beta perticle and gamma-ray. The nature and characteristics of the emission are tabulated below:
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