Physics (AS & A Level) · May / June 2022 · Paper 13 · Question 39

An actinium nucleus has a nucleon number of 227 and a proton number of 89. It decays to form a radium nucleus, emitting a β– particle and an α-particle in the process. What are the nucleon number and the proton number of this radium nucleus?

1. Anucleon number 223, proton number 87
2. Bnucleon number 223, proton number 88
3. Cnucleon number 224, proton number 87
4. Dnucleon number 225, proton number 86

As printed in the paper