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di nu An English physicist who demonstrated that the atomic number (the number of protons in an atom) determines most of the properties of an element. He began his study of radioactivity in Rutherford's laboratory but later decided to explore more on X-rays. 1 2.​

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Henry Moseley, in full Henry Gwyn Jeffreys Moseley, (born November 23, 1887, Weymouth, Dorset, England—died August 10, 1915, Gallipoli, Turkey), English physicist who experimentally demonstrated that the major properties of an element are determined by the atomic number, not by the atomic weight, and firmly established ...

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