The chemical symbol for radium is Ra\text{Ra}Ra and for radon is Rn\text{Rn}Rn. The following nuclear equation represents the radioactive decay of radium-226:
88226Ra→yxRn+24He {}^{226}_{88}\text{Ra} \rightarrow {}^{x}_{y}\text{Rn} + {}^{4}_{2}\text{He} 88226Ra→yxRn+24HeWhat are the numbers x x\,x and yyy?
x=222x = 222x=222, y=90y = 90y=90
x=222x = 222x=222, y=86y = 86y=86
x=230x = 230x=230, y=90y = 90y=90
x=230x = 230x=230, y=86y = 86y=86
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.