A nucleus has mass number 226 and atomic number 91. It undergoes a decay chain in which three different emissions occur. Each emission is selected from an alpha particle, a beta-minus particle, a beta-plus particle, a gamma ray and a neutron.
The table gives the total mass number and total charge number carried away by the three emissions.
| Quantity | Total |
|---|---|
| mass number | 4 |
| charge number | +3 |
State the three emissions in the decay chain.
Calculate the number of neutrons in the final nucleus.