In the final step of the uranium-235 decay series, the parent nuclide decays to a lead-207 nuclide

Question:

In the final step of the uranium-235 decay series, the parent nuclide decays to a lead-207 nuclide and a beta particle. What is the parent nuclide?

(a) 20682Pb

(b) 20882Pb

(c) 20783Bi

(d) 20781Tl

(e) None of the above.

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