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Q.

An artificial radioactive decay series begins with unstable94Pu241 . The stable nuclide obtained after eight α -decays and five β -decays is

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a

83Br209

b

82Pb209

c

82Se205

d

82Mg201

answer is A.

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Detailed Solution

Decrease in mass no.=8×4+5×0=32

Decrease in charge no.=8×2−5×1=11

Therefore (a) is the right choice.

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An artificial radioactive decay series begins with unstable94Pu241 . The stable nuclide obtained after eight α -decays and five β -decays is