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30 May, 07:10

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

+2
Answers (1)
  1. 30 May, 10:48
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    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.
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