Radioactive iodine-131 (t₁/2 = 8.0 days) decays to form

Last updated: 7/31/2022

Radioactive iodine-131 (t₁/2 = 8.0 days) decays to form xenon-131 by emission of a ß particle. How much of each isotope is present after each time interval if 82 mg of iodine-131 was present initially: (a) 8.0 days; (b) 32 days?