Bismuth, Bi\text{Bi}Bi, has a proton number equal to 83 and a nucleon number equal to 210.
Bismuth changes into polonium, Po\text{Po}Po, by emitting a β−\beta^-β−-particle.
Which equation correctly represents this decay?
21083Bi→21084Po+0−1β{}_{210}^{83}\text{Bi} \rightarrow {}_{210}^{84}\text{Po} + {}_{0}^{-1}\beta21083Bi→21084Po+0−1β
21083Bi+0−1β→21084Po{}_{210}^{83}\text{Bi} + {}_{0}^{-1}\beta \rightarrow {}_{210}^{84}\text{Po}21083Bi+0−1β→21084Po
83210Bi→84210Po+−10β{}_{83}^{210}\text{Bi} \rightarrow {}_{84}^{210}\text{Po} + {}_{-1}^{0}\beta83210Bi→84210Po+−10β
83210Bi+−10β→84210Po{}_{83}^{210}\text{Bi} + {}_{-1}^{0}\beta \rightarrow {}_{84}^{210}\text{Po}83210Bi+−10β→84210Po
484 exam-style questions on CIE IGCSE Physics 5.2 Radioactivity, covering 5.2.1 Background radiation and measuring count rate, 5.2.2a Alpha, beta and gamma emission, 5.2.2b Deflection and ionising effects of nuclear radiation, 5.2.3a Radioactive decay, 5.2.3b Effects of decay on the nucleus and decay equations, 5.2.4a Half-life, 5.2.4b Choosing isotopes for applications, and 5.2.5 Effects of ionising radiation and safety precautions. Each one has a worked solution and a mark scheme showing where the marks go.