A. van den Broek proposed that the weight of atom was approximately proportional to charge of atom (Later named Atomic Number) (0 h 13 min, 1 janv. 1911 ans – 6 h 3 min, 31 déc. 1911 ans)
Description:
Atomic number later used to label the elements in the Periodic TableAjouté au bande de temps:
Date:
0 h 13 min, 1 janv. 1911 ans
6 h 3 min, 31 déc. 1911 ans
~ 12 months