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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

`4alpha, 1 beta`

B

`3alpha, 7beta`

C

`8alpha, 1beta`

D

`4alpha, 7beta`

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The correct Answer is:
A
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