Explaining The Universe on Instagram: "The radioactivity of uranium comes from its unstable atomic nucleus, which naturally breaks down over time in a process called radioactive decay. Uranium atoms release energy in the form of alpha particles, beta particles, and gamma rays as they transform into more stable elements, eventually forming lead. The most common isotopes of uranium are uranium-238 and uranium-235, both of which decay very slowly, with half-lives of billions of years. Because of th