An original sample of the radioisotope fluorine-21 had a mass of 80.0 milligrams. Only 20.0 milligrams of this original sample remain unchanged after 8.32 seconds. What is the half-life of fluorine-21?
(1) 1.04 s (3) 4.16 s
(2) 2.08 s (4) 8.32 s
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