\( { }_{92} \mathrm{U}^{238} \) changes to \( { }_{85} \mathrm{At}^{210} \) by a series of \( \a....

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\( { }_{92} \mathrm{U}^{238} \) changes to \( { }_{85} \mathrm{At}^{210} \) by a series of \( \alpha \) and \( \beta \)
\( \mathrm{P} \)
decays. Find number of \( \alpha \)-decays undergone (an
W
integer).


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