Question

which isotope of uranium is most used in nuclear fission reactions?
uranium-235
uranium-238
uranium-233
uranium-239
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Explanation:

Uranium-235 is the only naturally occurring isotope of uranium that undergoes sustained nuclear fission easily, making it the primary isotope used in nuclear fission reactions for energy production and nuclear weapons. Uranium-238 is the most abundant uranium isotope but does not undergo sustained fission, Uranium-233 is man-made and less commonly used, and Uranium-239 is not a stable or widely used isotope for fission.

Answer:

Uranium-235