Which Happened First?

Discovery of plutonium

Discovery of plutonium
Image: Los Alamos National Laboratory · Attribution · source

Plutonium is a chemical element; it has symbol Pu and atomic number 94. It is a silvery-gray actinide metal that tarnishes when exposed to air, and forms a dull coating when oxidized. The element normally exhibits six allotropes and four oxidation states.

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Which happened first?

Timeline

  1. Discovery of francium1939
  2. Discovery of astatine1940
  3. Discovery of neptunium1940
  4. Discovery of plutonium (this page)1941
  5. Discovery of americium1944
  6. Discovery of curium1944

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Discovery of plutonium (1941) · Which Happened First?