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Number of alpha and beta particles emitted in a decay chain ending in lead-206

The same question, asked 2 times: 3 May 2023 S1*, 22 Apr 2025 S1. Every wording below, oldest first.

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  1. Question 1

    3 May 2023 S1

    30
    In the uranium radioactive series, the initial nucleus is 92238U_{92}^{238}\text{U} and the final nucleus is 82206Pb_{82}^{206}\text{Pb}. The number of α\alpha-particles and β\beta-particles emitted are

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  2. Question 2

    22 Apr 2025 S1

    2
     88Ra226\ _{88}R_{a}^{226} is converted into  82Pb206\ _{82}P_{b}^{206} by emission of alpha (α\alpha) and beta (β\beta) particles. The number of alpha and beta particles emitted are respectively

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