11. It took 138.5 days for 256.0 g of a radioactive isotope to decay to 8.0 g. What is the half-life of this isotope? (Bonus: What is this isotope?)
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The formula for radioactive decay is given by: $N(t) = N_0 \left(\frac{1}{2}\right)^{\frac{t}{t_{1/2}}}$ where $t_{1/2}$ is the half-life of the isotope. Show more…
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