a. How 235U is made unstable
235U is made unstable by the adding of a neutron the the parent nuclei.
b. How a chain reaction can occur
A chain reaction occurs when Uranium 235 atom splits, three neutrons are emitted and these may hit three other uranium atoms so that they split and emit more neutrons which in turn hit other atoms and so on.
c. How a chain reaction can be controlled
Chain reactions can be controlled by movable control rods, made out of boron or cadminum. They absorb neutrons in order to reduce or stop completley the chain reaction.
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