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If .(92)U^(238) changes to .(85)At^(210)...

If `._(92)U^(238)` changes to `._(85)At^(210)` by a series of `alpha`-and `beta` -decays, the number of `alpha` and `beta`-decays undergone is .

A

7 and 5

B

7 and 7

C

5 and 7

D

7 and 9

Text Solution

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The correct Answer is:
B
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