(from the article `radioactivity`) ...may exhibit retardations from equation (6) rates ranging to factors of thousands or more. The factor by which the rate is slower than the rate ... ...the chemical elements and their relative abundances. He discovered more such isotopes than anyone except Francis William Aston, the inventor of ... ...
[n] - a uranium isotope with mass number 235
noun a uranium isotope with mass number 235; capable of sustaining chain reactions
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. Also called