235U decays via alpha decay (by way of thorium-231) into 231Pa. For its very long half-life, it is still present in the Earth’s crust. 235U belongs to primordial nuclides, because its half-life is comparable to the age of the Earth (~4.5×10 9 years). This isotope has half-life of 7.04×10 8 years ( 6.5 times shorter than the isotope 238) and therefore its abundance is lower than 238U (99.28%). Uranium 235, which alone constitutes 0.72% of natural uranium is the second common isotope of uranium in the nature.
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