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Uranium-235 and uranium-238 are different isotopes of the element uranium. They have different mass numbers due to different numbers of neutrons.
That is the main use, to fuel nuclear power plants
Uranium-235 is an isotope of uranium making up about 0.72% of natural uranium.
Approx. 0,7 % uranium 235 in natural uranium.
Isotopes
Uranium 235 and uranium 238 are only natural isotopes of the element uranium.