Radioactivity is a property exhibited by certain types of matter of emitting energy and subatomic particles spontaneously. It is an attribute of individual atomic nuclei, and it is a natural and omnipresent component of the universe ,Radioactivity is caused by an atomic nucleus that is unstable and wants to give up some energy to shift to a more stable configuration ,During radioactive decay, the unstable nucleus emits energetic particles such as photons, electrons, neutrinos, protons, neutrons, or alphas ,The most common forms of spontaneous radioactive decay are the alpha ,particle, the beta ,particle, the gamma ,ray, and the neutrino ,Radioactivity can occur both naturally and through human intervention ,The degree of radioactivity depends on the fraction of unstable nuclei and how frequently those nuclei decay ,Radioactivity has various uses, including in nuclear power generation, medical diagnosis and treatment, and scientific research