Question

what is the reason for an uncontrolled fission reaction ending in an explosion?​

Answer 1

Answer:

Nuclear chain reaction

Explanation:

Nuclear chain reaction occurs when one single nuclear reaction causes an average of one or more subsequent nuclear reactions, thus leading to the possibility of a self-propagating series of these reactions. The specific nuclear reaction may be the fission of heavy isotopes (e.g., uranium-235, 235U). The nuclear chain reaction releases several million times more energy per reaction than any chemical reaction.