For more on this topic, see Nuclear Fission. Both of those neutrons collide with uranium-235 atoms, each of which fission and release between one and three neutrons, and so on. However, one neutron does collide with an atom of uranium-235, which then fissions and releases two neutrons and some binding energy. Two neutrons do not continue the reaction because they are lost or absorbed by a uranium-238 atom.
When a uranium-235 atom absorbs a neutron and fissions into two new atoms, it releases three new neutrons and some binding energy. This is known as a chain reaction and is what causes an atomic explosion. The fission process becomes self-sustaining as neutrons produced by the splitting of atom strike nearby nuclei and produce more fission. Fission occurs when a neutron strikes the nucleus of either isotope, splitting the nucleus into fragments and releasing a tremendous amount of energy. The isotopes uranium-235 and plutonium-239 were selected by the atomic scientists because they readily undergo fission.
The second weapon, dropped on Nagasaki, was called Fat Man and was an implosion-type device with a plutonium core. The first, Little Boy, was a gun-type weapon with a uranium core. developed two types of atomic bombs during the Second World War. The immense destructive power of atomic weapons derives from a sudden release of energy produced by splitting the nuclei of the fissile elements making up the bombs’ core.
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