Nuclear fission is the ____ up of the nucleus of an atom into two smaller nuclei. Energy, neutrons and ____ radiation are also emitted. Nuclear ____ uses Uranium ____ or Plutonium ____ to generate energy in nuclear ____ .A controlled chain reaction is maintained by the use of ____ rods which absorb some of the ____ produced. An ____ bomb or explosion is the consequence of an uncontrolled chain reaction.

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