How to understand19-the physical discovery or revolution at the turn of the 20th century?

The significance of discovering an electron (1) declares that atoms are separable. ② A new experimental technique has been created for studying electrons and atoms. The Discovery of X-rays The Significance of Roentgen Ray Discovery Because X-rays are related to the transition of electrons inside atoms, it shows that there are still unknown fields in physics that need to be searched urgently. X-ray itself has many practical values in medical treatment, material structure research and so on. The significance of the discovery of natural radioactivity The discovery of Becquerel ray is the first time that some elements themselves have spontaneous radiation, which has aroused people's concern about the nuclear issue. The above three discoveries broke the traditional concepts of immortality of matter, conservation of energy and indivisibility of atoms formed for hundreds of years, opened the prelude to the physics revolution and marked the transformation of physics research from macro to micro.