I know that other things are used like hydrogen, but as far as I know, uranium is more common. If all you need is to split an atom to create a nuclear explosion, why use a rare earth metal instead of something more abundant since everything is made of atoms?
In: Physics
Roughly speaking: the heavier an atom you split, the more energy you get by splitting it.
Uranium is the heaviest element that’s abundant *enough* for us to build things out of.
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