An exciting branch of science, which started as recently as World War II and has a clearly discernible future of great promise, is that of the “transuranium elements”. These are the man‐made chemical elements with atomic numbers greater than that of the heaviest natural element, uranium, which has the atomic number 92.
Glenn T. Seaborg; The man‐made chemical elements beyond uranium. Physics Today 1 August 1962; 15 (8): 19–30. https://doi.org/10.1063/1.3058316
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