A. van den Broek proposed that the weight of atom was approximately proportional to charge of atom (Later named Atomic Number) (0 ore 13 min, 1 gen 1911 anni – 6 ore 3 min, 31 dic 1911 anni)
Descrizione:
Atomic number later used to label the elements in the Periodic TableAggiunto al nastro di tempo:
Data:
0 ore 13 min, 1 gen 1911 anni
6 ore 3 min, 31 dic 1911 anni
~ 12 months