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Q.

83Bi214 decays to A by α-emission. A then decays to B by beta emission, which durther decays to C by another beta emission. Element C decays to D by still another beta emission, and D decays by o-emission to form a stable isotope E. What is element E?

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a

81Tl207

b

80Hg206

c

79Au206

d

82Pb206

answer is D.

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