A. van den Broek proposed that the weight of atom was approximately proportional to charge of atom (Later named Atomic Number) (0 ч 13 мин, 1 янв 1911 г. – 6 ч 3 мин, 31 дек 1911 г.)

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

26 дек 2017

684

0 ч 13 мин, 1 янв 1911 г.

6 ч 3 мин, 31 дек 1911 г.

~ 12 months

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