O-LevelPhysicsNuclear Physics5054/11 · May/June 2023 · Q361 Mark
The nucleus of an atom emits an alpha-particle. How do the proton number and nucleon number change?
Aproton number: decreases by 2; nucleon number: decreases by 4
Bproton number: decreases by 4; nucleon number: decreases by 2
Cproton number: increases by 2; nucleon number: increases by 4
Dproton number: increases by 4; nucleon number: increases by 2
✓ Correct answer
A: proton number: decreases by 2; nucleon number: decreases by 4
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