In a nuclear decay, an unstable atom releases energy or particles to reach a more stable state. The energy released is equivalent to the difference between the mass of the original atom and the resultant atom and particles.
The events involved in the decay arranged in order to describe the process:
1. The nucleus is unstable.
2. The nucleus start to fall apart.
3. Radiation, mass, and energy are released.
4. The nucleus is stable.
