The balanced reaction is;
87/36Kr ----> 87/35Br + 0/-1e
What is beta emission?
One kind of radioactive decay in which a beta particle is released from an atomic nucleus is called beta emission, or beta decay. Electrons with high energy and speed are known as beta particles.
As some unstable atomic nuclei work to achieve a more balanced ratio of protons to neutrons, a process known as beta decay takes place. It is essential to the nucleosynthesis process and helps to explain the behavior of some radioactive isotopes.