A nuclear bomb creates a nuclear reaction by either one of the two processes. Fission is when the nucleus breaks completely apart. Fusion is when one nucleus collapses onto another with a rapid domino affect. Because of these unique processes, heavier elements such as uranium are used for fission while lighter elements like hydrogen are used for fusion. As scientists continue to make nuclear bombs efficient, they always focus on two aspects of the bomb. They want the maximum destructive power, but the least after effect. For example, the bombings in Hiroshima and Nagasaki were both destructive and the after effects were devastating. This bomb used the strategy of an old fission bomb leaving horrible after effects. Modern day uses fusion bombs in which the result is much cleaner but also deadly because the nucleus does not explode, but rather decays over a period of a million years. Even though all the bombs are constructed a little differently, they include a shell to cover the bomb design, a trigger, and nuclear fuel.
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