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Uranium-234 decays to lead-214 through a series of alpha decays. Which of the following is the total number of alpha particles emitted in this decay series? A. 1 B. 2 C. 5 D. 10
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Uranium-234 decays to lead-214 through a series of alpha decays. Which of the following is the total number of alpha particles emitted in this decay series?

A. 1
B. 2
C. 5
D. 10

User Daniel Kluev
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1 Answer

4 votes
An alpha particle has a mass number of 4.
The mass number in the decay of uranium-234 to lead-214 decreases from 234 to 214, so by 20.
20 ÷ 4 = 5
5 alpha particles were emitted in this decay series. The answer is C.
User Dyao
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