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Plutonium (specifically Pu-238) is first isolated at Berkeley, California.
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Plutonium
Chemical element with atomic number 94 (Pu)
Plutonium is a chemical element; it has symbol Pu and atomic number 94. It was initially discovered and named Hesperium by Enrico Fermi in 1934. It is a silvery-gray actinide metal that tarnishes when exposed to air, and forms a dull coating when oxidized. The element normally…Source: Wikipedia (CC BY-SA)
Plutonium-238
Isotope of plutonium
Plutonium-238 is a radioactive isotope of plutonium that has a half-life of 87.7 years.Source: Wikipedia (CC BY-SA)