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All the Disintegrations of a Sample of an Unknown Nuclide

Question 49

Multiple Choice

All the disintegrations of a sample of an unknown nuclide weighing 4.6 × 10-2 g were counted. In the first half-life of the sample, the total number of disintegrations counted was 4.3 × 1020. What is the atomic weight of the unknown element?


A) 32 amu
B) 16 amu
C) 8 amu
D) 4 amu
E) None of these choices are correct.

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