Henry Moseley

By: Emily Magness

Life Span

Wednesday, Aug. 10th 191 at 12am to Tuesday, Aug. 10th 1915 at 12am

Weymouth, England


Henry Moseley, born in 1887, is credited with the significance of the atomic number. He developed the application of X-ray spectra to study atomic structure. He discovered from these X-ray's, that the wavelength of atoms corresponded with the atomic numbers in the way elements are organized on the periodic table. During this, he came up with the equation for wavelength that is still used today. Because of Moseley, the modern periodic table is based on the atomic number of elements.


“We have here a proof that there is in the atom a fundamental quantity, which increases by regular steps as one passes from one element to the next. This quantity can only be the charge on the central positive nucleus, of the existence of which we already have definite proof.”



He enlisted in the British Army during World War I. He was killed at the age of 27, by a Turkish sniper on August 10, 1915. Because of this, Britain established a new law that intelligent scientists would no longer be allowed to enlist.
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