1 окт 1913 г. - Atomic number

Описание:

In 1913, amateur Dutch physicist Antonius van den Broek was the first to propose that the atomic number determined the placement of elements in the periodic table.
He correctly determined the atomic number of all elements up to atomic number 50
Van den Broek did not have any method to experimentally verify the atomic numbers of elements; thus, they were still believed to be a consequence of atomic weight, which remained in use in ordering elements.

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