An unstable nucleus has a mass number of 38 and an atomic number of 19.
A detector records these measurements for the particle emitted when the nucleus decays.
| Measurement | Result |
|---|---|
| Mass number | 0 |
| Relative charge | +1 |
A technician predicts that the daughter nucleus has a mass number of 37 and an atomic number of 18.
Which particle is emitted?
Explain whether the technician's prediction is correct.