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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) (0 St. 13 Min, 1 Jan 1911 Jahr – 6 St. 3 Min, 31 Dez 1911 Jahr)

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

26 Dez 2017

686

0 St. 13 Min, 1 Jan 1911 Jahr

6 St. 3 Min, 31 Dez 1911 Jahr

~ 12 months

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