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Mass number and atomic number after a sequence of alpha and beta decays

This type of question, asked 3 times: 26 Jun 2022, 29 Jun 2022, 29 Jan 2023. All 3 questions below, oldest first.

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  1. Question 1

    26 Jun 2022

    18
    How many alpha and beta particles are emitted when Uranium  92U238\ _{92}U^{238} decays to lead  82 Pb206\ _{82}{\text{ }Pb}^{206} ?

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  2. Question 2

    29 Jun 2022

    95
    In the following nuclear reaction,
    D→αD1→β−D2→αD3⟶γD4D\overset{\alpha}{\rightarrow}D_{1}\overset{\beta^{-}}{\rightarrow}D_{2}\overset{\alpha}{\rightarrow}D_{3}\overset{\gamma}{\longrightarrow}D_{4}
    Mass number of DD is 182 and atomic number is 74. Mass number and atomic number of D4D_{4} respectively will be

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  3. Question 3

    29 Jan 2023

    30
    A radioactive element  92242X\ _{92}^{242}X emits two α\alpha-particles, one electron and two positrons. The product nucleus is represented by  P234Y\ _{P}^{234}Y. The value of PP is