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

Atoms, nuclei and radiation — practice question

The gold nucleus $^{{185}}_{{79}}\text{Au}$ is decaying by alpha emission. What are the nucleon number and proton number of the nucleus produced in this decay?

  • Anucleon number 183, proton number 79
  • Bnucleon number 183, proton number 77
  • Cnucleon number 181, proton number 77
  • Dnucleon number 181, proton number 75

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