So, an atom consists of protons, electrons, and neutrons. The nucleus of the atom is only composed of protons and neutrons, and electrons are surrounding the atom like a circle pretty much. So, a beta particle is an electron that happened to be in the nucleus, as a result of an unstable neutron dissecting into a proton and an electron. Since electrons are not supposed to be in the nucleus of an atom, the electron, or the beta particle, is released from the nucleus, if not the atom itself. The reason this occurrence transpires is to prevent the death of the atom. I hope that this has helped answer your question for you. Enjoy your day, and take care.
