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A radioactive nucleus undergoes a series...

A radioactive nucleus undergoes a series of decays according to the sequence `A overset(beta)rarrA_(1)overset(alpha)rarrA_(2) overset(alpha)rarrA_(3)`. If the mass number and atomic number of A3 are 172 and 69 respectively, what is the mass number and atomic number of A?

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The correct Answer is:
180, 172
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