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Henry Gwyn Jeffreys Moseley (November 23, 1887 – August 10, 1915) was an English physicist. His main contributions to science were the quantitative justification of the previously empirical concept of atomic number, in Moseley's law. This law advanced chemistry by immediately sorting the elements of the periodic table in correct order. It also advanced basic physics by providing independent support for the Bohr model of the Rutherford/Antonius Van den Broek nuclear atom containing positive nuclear charge equal to atomic number.