So as far as I know, nuclear fission uses high weight atomic elements to manufacture power. If the risk of runaway reactions are a major reason for not expanding this technology, why don't we use elements with lower atomic weight (eg. less energy) or lower amounts of fuel (eg. less total mass)?
Answer
The nuclei used are the ones which can be fissioned in a chain reaction!
The lighter ones You think of will not split. That's simply a result of experiments.
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