Power Plant Engineering
Natural uranium is made up of

99.282% U₂₃₅, 0.712% U₂₃₈, 0.06%' U₂₃₄
99.282% U₂₃₈, 0.712% U₂₃₅, 0.006% U₂₃₄
99.282% U₂₃₅, 0.712% U₂₃₄, 0.006% U₂₃₈
99.282% U₂₃₄, 0.712% U₂₃₈, 0.006% U₂₃₅

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Power Plant Engineering
In nuclear fission

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

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