Answer: uranium
Explanation: It’s hard to find when mining and is required for nuclear fission
The process of nuclear fission has been used to produce large energy that comes from splitting nuclei. Though energy produced is limitless but, the reactant or uranium restricts the production.
Nuclear fission is an energy-producing technique that uses uranium-235. The process of fission splits the nuclei into smaller nuclei to produce energy and gamma photons.
Uranium is the reactant in the fission process that is a non-renewable resource and is expensive to acquire from the mining process. It undergoes splitting to produce a large amount of tremendous energy.
Uranium is used in the process of nuclear fission as its atoms are easy to split and carry out the process of energy generation than other elements.
Therefore, uranium limits the product formation in nuclear fission.
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