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Question

Use the following table to assist in answering the question below.
NuclideHalf-Life
Uranium-238 4.51 x109 years
Uranium-234 2.48 x105 years
Thorium-230 8.0 x104 years
Radium-226 1.62 x103 years
Lead-210 20.4 years
The rate constant for the decay of unstable nuclide X by alpha-particle emission is 1.17x10-6/day. What is the identity of X?
A) radium-226
B) thorium-230
C) uranium-238
D) uranium-234
E) lead-210

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