A focused three-component revision and exam practice pack for SP6f, covering the complete Edexcel Separate Science Physics specification for beta minus and beta plus decay, the effects of each decay type on A and Z, gamma emission, and balancing nuclear equations (P6.18–P6.22).

Topic Mastery Sheet covers all five decay types in a reference table showing the change to Z and A for each (alpha: Z−2, A−4; beta minus: Z+1, A unchanged; beta plus: Z−1, A unchanged; gamma: no change; neutron: A−1); the mechanism of beta minus decay (neutron → proton + electron inside nucleus) and beta plus decay (proton → neutron + positron); the rule that nuclear equations must balance in both mass number and atomic number; and three worked nuclear equations including the U-235 fission equation from the Higher exam.

Student Exam Practice Sheet includes three parts on the proton-neutron chart (isotope identification, alpha decay product, beta decay explanation); the U-235 fission equation completion (requiring ⁹³₃₆Kr and 3 neutrons); and a two-mark beta minus mechanism question. Question format matches the Edexcel Higher test style.

Teacher Answer Key provides a complete mark scheme specifying that the beta decay explanation requires both “neutron → proton” and “electron emitted” for two marks, and that “Q undergoes beta decay” alone scores only one mark.

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