Atomic bomb
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The atomic bomb was developed first by the Manhattan Project in the early 1940s in the United States as a way to end World War II, which it did when dropped on the Japanese cities of Hiroshima and Nagasaki.
The atomic bomb detonates with a massive explosion due to the release of energy in atoms. Specifically, neutrons in a rapid chain reaction split the nuclei of a heavy chemical element, such as plutonium or uranium, to cause the massive release of energy.