Question $16$ of $39$

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A uranium$-235$ nucleus decays by a series of alpha and beta emissions until it reaches lead$-207.$ How many alpha emissions and how many beta emissions occur in this series of decays?

A

$7$ and $4$ $$ decays

B

$4$ and $7$ $$ decays

C

$5$ and $5$ $$ decays

D

$7$ and $10$ $$ decays

E

Cannot be determined

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