Iodine has many isotopes, but only iodine-127 is stable and is found in nature. one
radioactive iodine isotope, i-108, decays by alpha particle emission. iodine-131 is also radioactive and has many important medical uses.
82 determine the number of neutrons in an atom of i-127. [1]
83 explain, in terms of protons and neutrons, why i-127 and i-131 are different isotopes of iodine. [1]
85 determine the total time required for an 80.0-gram sampleof i-131 to decay until only 1.25 grams of the sample remains unchanged. [1]