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

Atoms, nuclei and radiation — practice question

Radon-211, $^{211}_{86}\text{Rn}$, francium-210, $^{210}_{87}\text{Fr}$, and radium-212, $^{212}_{88}\text{Ra}$, are three nuclides. For each nuclide, how many neutrons are present in its nucleus?

  • Aradon-211: $86$, francium-210: $87$, radium-212: $88$
  • Bradon-211: $125$, francium-210: $123$, radium-212: $124$
  • Cradon-211: $211$, francium-210: $210$, radium-212: $212$
  • Dradon-211: $297$, francium-210: $297$, radium-212: $300$

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