A. van den Broek proposed that the weight of atom was approximately proportional to charge of atom (Later named Atomic Number) (0h 13min, jan 1, 1911 y – 6h 3min, dec 31, 1911 y)
Description:
Atomic number later used to label the elements in the Periodic TableAdded to timeline:
Date:
0h 13min, jan 1, 1911 y
6h 3min, dec 31, 1911 y
~ 12 months