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The number of alpha" and "beta-prticles ...

The number of `alpha" and "beta`-prticles emitted in the nuclear rection
`""_(90)Th^(228) to ""_(83)Bi^(212)`.

A

Four alpha and one beta

B

Three alpha and seven beta

C

Eight alpha and one beta

D

One alpha and four beta

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The correct Answer is:
A
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