Abstract:

In the time order, the author proposes that the discovery and development of the periodic table of chemical elements are divided into four stages:point→1D→2D→3D. This article cites the main historical facts and documents available to unscramble the above four stages, which will facilitate the teaching and scientific research of the periodic table.

Key words: Chemical element plane periodic table, Germination, Formation, Perfection, Expansion, Element stereoscopic periodic law