During fission an atom is split apart into other things including neutrons. I know this starts a chain reaction because more neutrons are produced, but how is the first neutron (or group of neutrons) obtained and launched?
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Radioactive atoms are unstable by nature. When one of these enters fission spontaneously, it liberates one or more neutrons. If one of these neutrons, by luck, collide with another radioactive atom’s nucleus, the chain reaction begns.
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