Which particle is emitted by a radioactive nucleus during a decay process that results in its nucleon (mass) number decreasing by 4 and its proton (atomic) number decreasing by 2?
An alpha (α\alphaα) particle
A beta-minus (β−\beta^-β−) particle
A beta-plus (β+\beta^+β+) particle
A gamma (γ\gammaγ) ray
120 exam-style questions on CIE IGCSE Physics 5.2.3a Radioactive decay. Each one has a worked solution and a mark scheme showing where the marks go.