If nuclear fission in U-235 causes the atom to be split into 2 smaller atoms (such as Kr-92 and Ba-141) then how is it that U-236 is produced as waste since the U-235 was just split into smaller peices? Submitted by Ian98766 t3_10e7vgv on January 17, 2023 at 9:17 AM in askscience 165 comments 3,142