Date | Text | |
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23 Feb 1941
plutonium |
plutonium (chemistry) Chemical element 94, plutonium, is first synthesized by Glenn T. Seaborg, Arthur C. Wahl, Joseph W. Kennedy and Emilio Segrè. It is kept secret until after the atomic bombings of Hiroshima and Nagasaki, as it is being developed for the first atomic bombs. |