Edwin McMillan award received Nobel Prize in Chemistry
Pu
            
            
            
            94
            239
          
        
      
    
    {\displaystyle {\ce {{}^{238}_{92}U + {}^{1}_{0}n -> {}^{239}_{92}U ->[\beta^-][23\ {\ce {min}}] {\overset {neptunium}{^{239}_{93}Np}}->[\beta^-][2.355\ {\ce {days}}] {}^{239}_{94}Pu}}}
  This proved that the unknown radioactive source originated from the decay of uranium and, coupled with the previous observation that the source was different chemically from all known elements, proved beyond all doubt that a new element had been discovered. McMillan and Abelson published their results in an article entitled Radioactive Element 93 in the Physical Review on May 27, 1940. They did not propose a name for the element in the article, but they soon decided on "neptunium", since uranium had been named after the planet Uranus, and Neptune is the next planet beyond in our solar system. McMillan suddenly departed for war-related work at this point, leaving Glenn Seaborg to pursue this line of research and discover the second transuranium element, plutonium. In 1951, McMillan shared the Nobel Prize in Chemistry with Seaborg "for their discoveries in the chemistry of the transuranium elements".
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