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The number of alpha and beta-particles e...

The number of `alpha` and `beta`-particles emitted in the nuclear reaction `._(90)^(210) Th to ._(83)^(212)Bi` are:

A

`8 alpha, 1 beta`

B

`4 alpha, 7 beta`

C

`3 alpha, 7 beta`

D

`4 alpha, 1 beta`

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The correct Answer is:
d
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