Antonius Van den Broek
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Antonius Van den Broek (May 4, 1870 - October 25, 1926) was a Dutch amateur physicist (a real estate lawyer by training). He is notable mostly for being the first who realized that the number of an element in the Periodic table corresponds to its total number of electrons, and therefore the charge of the atom nucleus. This idea was contained in his paper published in Nature on June 20, 1911, just one month after Rutherford published the results of his experiments that showed the existence of a small charged nucleus in an atom.