A-LevelPhysicsNuclear physics9702/12 · Oct/Nov 2009 · Q361 Mark
The gold nucleus ¹⁸⁵₇₉Au undergoes alpha decay. What are the nucleon (mass) number and proton (atomic) number of the nucleus formed by this decay?
Anucleon number: 183, proton number: 79
Bnucleon number: 183, proton number: 77
Cnucleon number: 181, proton number: 77
Dnucleon number: 181, proton number: 75
✓ Correct answer
C: nucleon number: 181, proton number: 77
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