Abstract Holland physicist Lorentz provided a theoretical basis for the discovery of atomic internal electrons by creating the electron theory in 1892 and British physicist J.J.Thomson discovered free electrons from the cathode rays in 1897, which successfully broke the traditional concept that atom was inseparable. Then, Rutherford, Bohr and others began to explore the internal structure of atoms. At the same time, chemists began to introduce physical electrons to chemistry and use the electrons from atoms to explain chemical behavior. They proposed the electron theory of the chemical bond and promoted the development of the theory of chemical bond.
