|Two unequal fragments|
The diagram above shows the location of the fission products of uranium 235 on the map of nuclei. As we can see, the nucleus splits into two unequal fragments. There are two distinct groups of nuclei, with the more abundant fission products coloured in red (the abbreviation phm indicates one part per hundred million). The nuclei produced by the fission of uranium also inherit uranium neutron surplus, which leads both to their instability and radioactivity.