Discussion
The isotope of uranium capable of sustaining chain reaction is
Answer: A
Uranium-235 is the isotope that sustains a chain reaction. It fissions when it absorbs a slow neutron and releases two or three more, which can go on to split further nuclei.
It makes up only 0.7 per cent of natural uranium; the rest is U-238, which does not fission with slow neutrons. Enrichment raises the U-235 fraction for reactor fuel.
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