Approximately 104 pounds of Uranium 235 is needed for the critical mass to occur. If it is less than 104 pounds, no reaction will occur.
An isotope of uranium called uranium-235 makes up about 0.72 percent of natural uranium. It is fissile, which means that it may support a nuclear chain reaction, in contrast to the dominating isotope uranium-238.
A chain reaction is a series of reactions in which a reactive product or byproduct sparks the occurrence of other reactions.
Therefore, approximately 104 pounds of Uranium 235 is needed for the critical mass to occur. If it is less than 104 pounds, no reaction will occur.
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