U-235
Chemistry.
1.
uranium 235.
noun, Chemistry.
1.
the radioactive uranium isotope having a mass number of 235, comprising 0.715 percent of natural uranium. When bombarded with neutrons it undergoes fission with the release of energy.
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Chemistry. 1. uranium 238. noun, Chemistry. 1. the radioactive uranium isotope having a mass number 238, comprising 99.28 percent of natural uranium: used chiefly in nuclear reactors as a source of the fissionable isotope plutonium 239.
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Chemistry. 1. uranium 239. noun, Chemistry. 1. the uranium isotope with a mass number 239. It is artificially produced by the neutron bombardment of uranium 238.
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