Physics 0625 · IGCSE · Radioactivity

Radioactivity — practice question

Na is the chemical symbol for sodium. The equation below shows the radioactive decay of sodium-24. $^{24}_{11}\text{Na} \rightarrow ^{24}_{x}\text{Mg} + ^{y}_{-1}\text{e}$ Which numbers are $x$ and $y$?

  • A$x = 10,\ y = 0$
  • B$x = 10,\ y = 1$
  • C$x = 12,\ y = 0$
  • D$x = 12,\ y = 1$

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