In `._92U^(238)` radioactive series by `alpha` decay or `beta` decay, which one of the following can be the end product: `Pb^(206),Pb^(207),Pb^(208),Pb^(209)`?
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As is known, in `alpha`-decay, mass number decreases by 4 and charge number remains unchanged and charge number increases by one. Therefore, `alpha`-decay and `beta`-decay would involve change in mass number in multiple of 4 only. for this to happen, the end product of the series must be `Pb^(206)`.
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