Chemistry: This Day in Science History - August 10 - Henry Moseley

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This Day in Science History - August 10 - Henry Moseley Aug 9th 2011, 22:05 August 10th marks the passing of Henry Moseley. Moseley was the English physicist who gave meaning to an element's atomic number. Before his work, the atomic number of an element was just its position on the periodic table. Moseley related an element's atomic number to the charge of that element's nucleus. Today, an element is determined by its atomic number or the number of protons in its nucleus. Unfortunately, World War I interrupted this physicist's career when he enlisted in the Royal Engineers. He was killed during the Battle of Gallipoli in 1915 when he was only 27 years old. Find out what else occurred on this day in science history. Follow Chemistry on Facebook or Twitter.

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