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July 31, 2021
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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 Table

Added to timeline:

26 Dec 2017
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0
266
History of the Periodic Table

Date:

0h 13min, jan 1, 1911 y
6h 3min, dec 31, 1911 y
~ 12 months

Images:

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