Physics 9702 · AS & A Level · Atoms, nuclei and radiation

Atoms, nuclei and radiation — practice question

If a gamma ray collides with a magnesium nucleus $^{25}_{12}\text{Mg}$, a sodium nucleus $^{24}_{11}\text{Na}$ is produced and one further particle is released. What are the nucleon number (mass number) and proton number (atomic number) of the additional particle formed in this nuclear reaction?

  • Anucleon number $0$, proton number $-1$
  • Bnucleon number $0$, proton number $1$
  • Cnucleon number $1$, proton number $-1$
  • Dnucleon number $1$, proton number $1$

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