As an independent discipline, chemistry has only experienced one or two hundred years since its birth, and its development should be accelerating. From the discovery of electrons, the establishment of the periodic table of elements, to the emergence of various analytical methods and testing instruments in modern times, the activities of electrons, the recombination and destruction of atoms are studied, which are all realized through the flow of electrons. Everything is like this. A stone, a tree, an organism, including people are piles of atoms. The emergence and development of chemistry comes from the desire of human beings to explore and understand nature. The more it goes back to the early days like Aristotle, the closer it is to philosophy. The confusion and incomprehension of human beings have led to further thinking. The understanding of electrons has always been accompanied by the development of chemistry. Chemists have established various theories to try to explain its behavior, but it seems that they want to understand what an electron is and what it looks like in the change of matter, which is probably beyond words. Just like what a photon is, particle theory and wave theory have been opposed for so long, and finally it is concluded that they are both. What is its reason and how to explain these theories. However, the endless spirit of human exploration is the most touching. Just like now, a small and simple change in nature is happening all the time. Chemists will spend their whole lives, even generations, trying to study and understand, but they are also the luckiest. The world in a grain of sand can be seen through these smallest changes, but they only need a pious heart. Now knowledge is snowballing, but one day this huge book will be read thin. Everything is nothing, and it will be simplified after going through complexity, which will be a new beginning. Excerpt from: DOTAcaicai I hope it will help you. If you are satisfied, don't forget to adopt it. Thank you.