3 gen 1869 anni - Dimitri Mendellev used John Newlands' grouping and organized the elements into what is now known as the periodic table. He used the atomic mass as the primary characteristic to decide where each element belonged in his table. The elements were arranged in rows and columns. He even left spaces for elements to be discovered because of the pattern he saw once he started organizing those elements known at that that time.
Aggiunto al nastro di tempo:
Data:
3 gen 1869 anni
Adesso
~ 155 years ago
