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 =

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.