2 marzo 1860 anni - De Chancourtois was a French scientist and the first to arrange the periodic table considering the atomic weight of elements. This way, he made use of a physical property that can be represented as numbers. The elements were arranged in order of increasing weight. He arranged the elements in a cylinder as a spiral called telluric helix. The helix allowed to see similar elements lined up vertically
Aggiunto al nastro di tempo:
Data:
2 marzo 1860 anni
Adesso
~ 165 years ago