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.90^232 Th an isotope of thorium decays ...

`._90^232 Th` an isotope of thorium decays in ten stages emitting six `alpha-`particle and four `beta-`particle in all. The end product of the decay is.

A

`._90^232 Th`

B

`._82^206 Pb`

C

`._82^209 Pb`

D

`._82^208 Pb`

Text Solution

Verified by Experts

The correct Answer is:
C
( c) New mass number `A' = A - 4n_alpha = 232 - 4 xx 6 = 208` Atomic number
`Z' = Z + n_beta - 2 n_alpha =90 + 4 - 2 xx 6 = 82`.
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