While Dmitri Mendeleev usually gets credit for the invention of the modern periodic table in 1869, Alexandre-Emile Béguyer de Chancourtois organized the elements by atomic weight five years earlier. While Mendeleev and Chancourtois arranged elements by atomic weight, the modern periodic table is ord...
“The whole atom spins and quivers, and has to be steadied before exact observation is possible,” they wrote. The six little bodies are arranged in two sets of three, forming two triangles that are not interchangeable. Further, the six bodies are not all alike; they each contain three ...
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The periodic table, also called the periodic table of elements, is an organized arrangement of the 118 known chemical elements. The chemical elements are arranged from left to right and top to bottom in order of increasing atomic number, or the number of protons in anatom's nucleus, which ge...