The uranium currently present on Earth consists of two

Last updated: 6/28/2023

The uranium currently present on Earth consists of two isotopes 238U at 99 28 and 235U at 0 72 The half lives are 4 51x109 and 7x108 years respectively Calculate the time that has elapsed since the relative abundance in nature of each isotope was 50 Relative abundances are given in atomic percentage