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

Atoms, nuclei and radiation — practice question

A gamma ray collides with a magnesium nucleus $^{25}_{12}\text{Mg}$, producing a sodium nucleus $^{24}_{11}\text{Na}$ and releasing one more particle. What are the nucleon number (mass number) and proton number (atomic number) of that other particle 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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