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chemistry (need some help)

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In a series of decays (hypothetical), the nuclide Ra-227 beomes Pb-203. How many alphas and how many betas are emitted in this series? Give two answers: first, give the number of alpha decays; then, the number of beta decays.

I know that there are 6 alpha decays happening. I just do not get the beta decay part.

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