Henry Moseley (1887-1915). Caricature of the English physicist Henry 'Harry' Moseley. Moseley is best known as the developer of X-ray analysis. He developed the ideas of Laue and the Braggs on X-ray refraction, showing that the characteristic wavelength of each element was in direct relationship to the number of protons in the nucleus. This allowed a fine-tuning of Mendeleev's periodic table of elements, which was ordered by atomic weight, and showed that only 92 elements could exist from hydrogen to uranium. This X-ray analysis was used to confirm new discoveries. Moseley was killed at Gallipoli in 1915 whilst serving in the Royal Engineers.
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