= Harold Urey
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<Harold Urey> identified <deuterium> through the <spectrum> of a <hydrogen> sample enriched by low-<temperature> <distillation>. Ordinary <hydrogen> and <deuterium> have the same <atomic number> but different <atomic mass>; the small spectral displacement offered a way to recognize the heavier <isotope>.https://www.nist.gov/history/nbsnist-culture-excellence/harold-c-urey-ferdinand-g-brickwedde-and-discovery-deuterium[NIST historical account of the 1931 spectroscopic identification and enriched hydrogen sample]{ref}
A physical <chemist> whose name is used in the planetary <Urey ratio>.
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Harold%20Urey.jpg?width=250]
{title=Portrait of <Harold Urey>}
{description=Portrait from NASA History, photographer not stated on the Commons file page. The file page identifies it as public-domain NASA material.}
{source=https://commons.wikimedia.org/wiki/File:Harold_Urey.jpg}
{width=250}
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