3. lodine-131 is used to destroy thyroid tissue in the treatment of an overactive thyroid. the
half-life of lodine-131 is 8 days. if a hospital receives a shipment of 200g of iodine-131, how
much 1 - 131 would remain after 32 days?
radioisotope:
half life
starting mass =
final amount =
starting time =
end time =

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.