An actinium nucleus has a nucleon number of $227$ and a proton number of $89$. It decays to produce a radium nucleus, with a beta particle and an alpha particle emitted in the process. What are the nucleon number and the proton number of the radium nucleus?
- Anucleon number $223$, proton number $87$
- Bnucleon number $223$, proton number $88$
- Cnucleon number $224$, proton number $87$
- Dnucleon number $225$, proton number $86$