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)

Atomic number later used to label the elements in the Periodic Table

26 Dec 2017

578

0h 13min, jan 1, 1911 y

6h 3min, dec 31, 1911 y

~ 12 months

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