![u-235 u-235](https://www.tekportal.net/wp-content/uploads/2018/11/u-235.gif)
Chemistry.
- uranium 235.
noun Chemistry.
- 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.
Chemistry.
noun Chemistry.