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Physics (AS & A Level) · Oct / Nov 2016 · Paper 12 · Question 39

9702Atoms, nuclei and radiation

The calcium nuclide $^{42}_{20}\text{Ca}$ is formed by $\beta^-$ decay. What are the nucleon (mass) number and proton (atomic) number of the unstable nuclide that underwent $\beta^-$ decay to form the calcium nuclide?

  1. Anucleon number 41, proton number 19
  2. Bnucleon number 41, proton number 21
  3. Cnucleon number 42, proton number 19
  4. Dnucleon number 42, proton number 21

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Correct answer: C. nucleon number 42, proton number 19

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