How is a chain reaction initiated in nuclear fission reactions?
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In nuclear fission reactions, a chain reaction is initiated by bombarding fissile isotopes (such as uranium-235 or plutonium-239) with neutrons. When a fissile nucleus absorbs a neutron, it becomes unstable and splits into two or more smaller nuclei, releasing additional neutrons. These neutrons can then trigger further fission events, leading to a self-sustaining chain reaction.