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Person

Henry Moseley

A man in formal attire with a mustache and neatly combed hair, wearing a suit and tie, stands against a dark background.

English physicist (1887–1915) who worked under Rutherford at Manchester and discovered that the frequencies of an element's characteristic X-rays scale with the square of an integer he called the atomic number — the count of protons in the nucleus. This reordered the periodic table on a physical rather than a chemical basis. He was killed by a sniper at Gallipoli at the age of 27.

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