Henry Moseley was a British physicist and chemist, born on November 23, 1887, and who died on April 10, 1915. He is best known for his work in atomic physics, particularly for formulating Moseley's Law, which relates the atomic number of an element to its X-ray emission spectra. His research demonstrated that the atomic number, rather than the atomic mass, should be the organizing principle for the periodic table of elements.
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