Final answer:
A beta particle is represented by the symbol β or ^0 v-1 β. It is a fast-moving electron emitted during beta decay, where a neutron in the nucleus converts into a proton.
Step-by-step explanation:
A beta particle is represented by the symbol β or ^0 v-1 β. It is a fast-moving electron with an atomic number of -1, a charge of -1, and negligible mass. Beta particles are emitted during beta decay, where a neutron in the nucleus converts into a proton, resulting in a decrease in the atomic number by 1 while the mass number remains the same.