Final answer:
Fission reactions require specific conditions like high temperatures and specific isotopes to occur.
Explanation:
Fission reactions require specific conditions to occur:
- Nuclei that are larger than iron-56 undergo fission where they split into smaller nuclei.
- Two nuclei collide for fusion to occur at high temperatures to overcome repulsion.
- In nuclear reactors, a fissionable isotope, a moderator, a coolant, and a control system are needed to sustain controlled chain reactions.
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