Power Plant Engineering
In nuclear fission

The original elements change into completely different elements
The molecules rearrange themselves to form other molecules
None of the listed here
The electrons of the element change

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Power Plant Engineering
Enriched uranium is one in which

Percentage of U has been artificially increased
Percentage of U₂₃₄ has been artificially increased
Percentage of U₂₃₅ has been artificially increased
Extra energy is pumped from outside

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