Radioactivity is the phenomenon of the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei. The particles released during radioactivity are associated with energy which s called radioactive energy. The decaying rate of these atoms is constant over time. During the decay in radioactivity, an atom with a nucleus transforms into another atom with a different nucleus. This transformation results in emission of energy called radiation. Unstable atomic nuclei will spontaneously decompose to form nuclei with a higher stability.