- A beta particle is an electron emitted from a nucleus.
- The beta particles are very small and move with very high speed.
- During beta decay, a radioactive atom X decay and emits a beta particle ( 0-1e).
- One of the neutron is disintegrated to become proton and electron. The electron is emitted out from the nucleus whereas the proton stays in the nucleus.
- Therefore proton number increase by 1 and the nucleon number remain unchanged.