Answer
It could emit two beta particles and one alpha particle.
Work Step by Step
The atomic number decreases by 2 for alpha emission, because alpha particles carry a charge of +2e.
The atomic number increases by 1 for beta emission, because beta particles carry a charge of -1e.
After emitting two beta particles and one alpha particle, the atomic number would be the same, and it would be the same element. However, it would be a different isotope because its mass number would be down by 4.
This is discussed on pages 628-629.
