What makes uranium unstable

This causes the nucleus to become uranium, which is violently unstable. The entire nucleus splits into two large fragments called ''daughter nuclei. '. In. Stable and Unstable Nuclei | Radioactivity | Physics | FuseSchoolHow do you know if Our teachers and animators come together to make fun. to produce thermal fission of uranium, which produces another in two extremely unstable fission fragments, a barium and a krypton nucleus.