= Henry Moseley
{c}
{tag=Physicist}
{wiki}
= Henry Gwyn Jeffreys Moseley
{c}
{synonym}
= H. G. J. Moseley
{c}
{synonym}
<Henry Moseley> measured characteristic <X-ray> <frequencies> across a sequence of <chemical elements>. For a given series, the square root of the <frequency> is approximately linear in <atomic number> after a screening offset is included. The regularity connects a spectral measurement with a discrete nuclear-charge label, rather than merely correlating with <atomic weight>. Missing positions in that sequence also made <X-ray spectroscopy> a way to test and extend the periodic ordering of <chemical elements>.<The High-Frequency Spectra of the Elements. Part II by Henry Gwyn Jeffreys Moseley>[1914 paper, pp. 703–713: characteristic lines, atomic-number sequence and spectral regularity]{ref}
A <physicist>.<Moseley and X Rays by University of Oxford Department of Physics>[Independent professional biography and identity]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Portrait%20of%20Henry%20G.J.%20Moseley%2C%201887-1915%2C%20in%20lab%20holding%20a%20glass%20globe%2C%20from%20Nature%20magazine%20%28cropped%29.jpg?width=250]
{title=Portrait of <Henry Moseley>}
{description=Nature magazine; Science Service / Smithsonian Institution Archives; existing crop by Filetime, via Wikimedia Commons. Public domain in the United States under the exact File page’s PD-US-expired declaration for pre-1931 publication; no wider territorial determination added. https://creativecommons.org/publicdomain/mark/1.0/[Source usage terms], via Wikimedia Commons.}
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{width=250}
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