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Why is only uranium 235 used in the atom bomb?

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The Difference Between the Bombs. Little Boy and Fat Man utilized different elements and completely separate methods of construction in order to function as nuclear weapons. read more

In 1934, a team led by Italian scientist Enrico Fermi began bombarding uranium atoms with neutrons, producing much smaller atoms, such as barium, and some neutrons. This process came to be known as nuclear fission. read more

The element used in atomic bombs is Uranium-235. Uranium's atoms are unusually large, and henceforth, it is hard for them to hold together firmly. This makes Uranium-235 an exceptional candidate for nuclear fission. Uranium is a heavy metal and has many more neutrons than protons. read more

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Can a Hydrogen atom be split? + Example
Source: socratic.org

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