Physics · Oct / Nov 2019 · Paper 12 · Question 40
An isotope of lead, $^{212}_{82}\text{Pb}$, is radioactive. After three decays, two beta-particles and an alpha-particle have been emitted. Another radioactive isotope of lead is formed. What is the mass number (nucleon number) of the new isotope of lead?
- A200
- B208
- C212
- D216
As printed in the paper
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Correct answer: B. 208
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