Essay
One of the routes for radioactive decay of U-238 to Pb-206 involves the successive emission of alpha, two beta, four alpha, beta, alpha, beta, alpha, beta, alpha, and beta particles.
a. By consideration of the atomic and mass numbers of all species in this reaction, show that the statement above is consistent.
b. Identify the first five isotopes encountered during this process.
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a. The decrease in mass number from 
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