Uranium-235

Origin

uranium + 235 the atomic mass of this isotope.

Full definition of uranium-235

Noun

1. (isotope) An isotope of uranium, used for energy generation and in atomic weapons, containing one hundred and forty-three neutrons. It has a half-life of 7·038×10⁸ years, whereupon it decays into thorium-231.

Usage notes

In scientific literature, the more technically correct abbreviation is used, rather than U-235.