In general terms, enough U235 or Pu239 to form a critical assembly, but in separate small pieces. Also a high explosive charge of the required shape. When required to fire, the HE charge drives the pieces of U235 or Pu239 together with great force, causing a nuclear explosion. The precise details are secret, and best if they stay that way.
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The main components of an atomic bomb are enriched uranium or plutonium as the fissile material, conventional explosives to create critical mass, and a trigger mechanism to initiate the nuclear reaction. These ingredients, when combined, result in a nuclear chain reaction leading to a massive release of energy.
An atomic fission bomb consists of:
An atomic fusion bomb consists of:
uranium-235 is used in some of the creatings of a atomic bomb.Others are made up of plutonium-239 and high explosive charges
I suggest Richard Rhodes book The Making of the Atomic Bomb.
In general, a fusion bomb (hydrogen bomb) is more powerful than a fission (atomic) bomb. Fusion bombs use an atomic bomb to begin the fusion reaction.
atomic bomb
No, the atomic bomb relies on the process of nuclear fission, which produces radioactivity as a byproduct. Radioactivity is essential for the explosive power of the bomb.
The first atomic bomb was detonated at the Trinity test site in New Mexico, USA, on July 16, 1945. It did not "land" in the traditional sense as it was detonated in the air.