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1-8: Summary of Part 1

Let us summarize what we have learned in Part 1.
(1) If we divide matter into finer and finer portions, we reach atoms and molecules. Originally, they were considered to be the minimum constituents of the matter.
(2) It has been clarified that there exists a minimum element of electric charge, i.e. the elementary charge e.
(3) Moreover, there exists an electron which is much lighter than the atoms. It has also been clarified that the electron possesses a negative charge -e.
(4) It has become clear that the electron is one of the common constituents of atoms.
People understand that both matter and electricity are not continuous but consist of collections of the fundamental quantities. Let us call this the atomic nature of matter and electricity.

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