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AP Physics 2
15.8 Types of Radioactive Decay
15.7 Fission, Fusion, and Nuclear Decay
IntermediateMCQMathematicalConceptual15.7k
An unstable parent nucleus with mass number \(A = 232\) and atomic number \(Z = 90\) undergoes the four-step decay chain listed below.

I. Alpha decay to form nucleus \(\text{Y}_1\)
II. Beta-minus (\(\beta^-\)) decay of nucleus \(\text{Y}_1\) to form nucleus \(\text{Y}_2\)
III. Beta-minus (\(\beta^-\)) decay of nucleus \(\text{Y}_2\) to form nucleus \(\text{Y}_3\)
IV. Alpha decay of nucleus \(\text{Y}_3\) to form nucleus \(\text{Y}_4\)

OptionAtomic Number of \(\text{Y}_2\)Mass Number of \(\text{Y}_4\)Atomic Number of \(\text{Y}_4\)
(A)8722488
(B)8922886
(C)8922488
(D)9122490

Which row in the table correctly identifies the atomic number of intermediate nucleus \(\text{Y}_2\) and the mass number and atomic number of final nucleus \(\text{Y}_4\)?

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