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When one neutron from U-235 fission reaction causes another nucleus of this metal to undergo fission, it causes the entire chain reaction to continue.
This condition is called the “critical condition” while the mass of U-235 required to produce this condition is called “critical mass”.
The decay chain of this radioactive metal is known as the Actinium Series with Thorium-231 being the next isotope in this decay process.
It makes Thorium-231 the daughter nuclide of this isotope.
This is due to the reason that the concentration of U-235 is very low in naturally occurring Uranium.It is possible to achieve critical chain reaction with low concentration U-235.In these cases, the neutrons are moderated to lower their speed in the reaction as the chances of fission are greater with slow neutrons than with fast neutrons.Following is one decay equation for the Alpha decay of this isotope: He Here, the He (Helium) is representing one Alpha (α) particle.Uranium-235 undergoes spontaneous fission during radioactive decay; however, no standard equation can represent this reaction as its results are quite unpredictable.