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Dempster, Arthur Jeffrey

Dempster, Arthur Jeffrey (1886-1950), was an American physicist. In 1935, Dempster discovered uranium 235 (U-235), a rare isotope (form) of the element uranium. This uranium isotope is a key substance in the atomic bomb.

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Please copy/paste the following text to properly cite this How Stuff Works article:

"Dempster, Arthur Jeffrey." 30 August 2007. HowStuffWorks.com. <http://reference.howstuffworks.com/dempster-arthur-jeffrey-encyclopedia.htm> 17 May 2008.