In the diagram, the circle shows an atom (not drawn to scale), with the nucleus located at the centre. A particle from a radioactive source moves towards the atom’s nucleus. The curved arrow indicates the particle’s route. What is the particle’s nature and charge?
- A$\alpha$-particle, negative
- B$\alpha$-particle, positive
- C$\beta$-particle, negative
- D$\beta$-particle, positive