12. The most common isotope of Uranium, 238U92, radioactively decays into lead, 206Pb82, by a means of a series of alpha and beta particle emissions. How many of each particle must be emitted.
A) 16 alphas, 16 betas
B) 16 alphas, 8 betas
C) 8 alphas, 6 betas
D) 4 alphas, 18 betas