Title : Briefly talk over four stages of formation and development of the periodic table of chemical elements, the “point、1d、2d、3d”
Abstract:
The author is the founder of the "three-dimensional Periodic Law of Chemical Elements", and this research direction was an original topic of the author when he was a sophomore in 1957. After years of continuous research, it has been found that the discovery and development process of the periodic table of chemical elements can be clearly divided into four stages in chronological order: "point → line → planer → volume"(That is, Point, 1D, 2D, 3D). From ancient times to the end of the 18th century, it was a "point" type stage. Human understanding of chemical elements remained at the level of individual discoveries. From the discovery of iron in the Iron Age and copper in the Bronze Age, to the end of the 18th century, a total of 33 elements including gold, silver, copper, iron, cobalt, tin and lead were recognized, which was a fragmented exploration of elements. Until after the 1830s, the "three element group", "spiral diagram", "element table", "eight-tone law" and so on emerged, which was the second stage of the periodic table of chemical elements. The "linear periodic law of one-dimensional elements" is the first milestone in the history of chemistry. The third stage was when the Russian scientist D. И. Mendeleev established the "Two-dimensional periodic table of elements” in 1869, which was the second milestone in the history of modern chemistry. The "planar periodic table of elements" played a huge role in promoting the development of chemistry. However, the "Two-dimensional periodic Table of Elements" can only cover 118 "chemical elements", and there are ten major shortcomings, limitations, and drawbacks. Based on this, the "3D periodic law of elements" constructed by the author has become the fourth stage of the development of the periodic law, namely the "volumetric" stage, and also the third milestone in the history of the development of the periodic law of chemical elements. This theory not only overcomes the inherent defects of the traditional "2D periodic table of elements", but also can accommodate 2,787 isomorphic elements.
The "2D planar periodic law of elements" mainly describes the arrangement of electrons outside the nucleus, which determines the chemical properties of elements and the synthesis of molecules. In contrast, the "3D Periodic Law of Elements" focuses on the arrangement of the difference between neutrons (n) and protons (p) within the nucleus, which determines the properties of the atomic nucleus and the existence of isotopes. Through years of in-depth exploration, I later proposed the "Isotope Center Theory," This theory has two laws, one constant, and two new parameters (SNP and DNP). This laid the foundation for the establishment of "Nuclear Isotope Science".

