uranium-235

== English == === Etymology === From uranium + 235 (the atomic mass of the isotope). === Noun === uranium-235 (uncountable) (physics) A fissile isotope of uranium, used for energy generation and in atomic weapons, containing 143 neutrons. It has a half-life of 7.038×108 years; it decays into thorium-231 and ultimately lead. ==== Usage notes ==== In scientific literature, the more technically correct abbreviation 23592U (or 235U) is used, rather than U-235. === See also ===