The end product formed by the disintegration of \( { }_{88}^{226} \mathrm{R} \) a is
(A) \( { }_...
The end product formed by the disintegration of \( { }_{88}^{226} \mathrm{R} \) a is
(A) \( { }_{81}^{204} \mathrm{Tl} \)
(B) \( { }_{82}^{206} \mathrm{~Pb} \)
(C) \( { }_{86}^{222} \mathrm{Ra} \)
(D) \( { }_{83}^{207} \mathrm{Bi} \)
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