A-LevelPhysicsNuclear physics9702/12 · Oct/Nov 2016 · Q391 Mark
The calcium nuclide ⁴²₂₀Ca is formed by β⁻ decay. What are the nucleon (mass) number and proton (atomic) number of the unstable nuclide that underwent β⁻ decay to form the calcium nuclide?
Anucleon number: 41, proton number: 19
Bnucleon number: 41, proton number: 21
Cnucleon number: 42, proton number: 19
Dnucleon number: 42, proton number: 21
✓ Correct answer
C: nucleon number: 42, proton number: 19
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