Recall that radioactive/nuclear decay of isotopes follows first-order kinetics, and the integrated rate law for first-order reactions is:
Step 1. Calculate for the decay constant (k):
half-life = 3.1 min:
The isotope 208Tl undergoes β decay with a half-life of 3.1 min.
(c) What percentage of a sample of pure 208Tl remains un-decayed after 1.0 h?
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