uranium-235
English
![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/47/U-235.png/220px-U-235.png)
Etymology
uranium + 235 the atomic mass of this isotope.
Noun
- (physics) 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 23592U is used, rather than U-235.