Word: uranium
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Dates: during 1930-1939
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...June 1934 a distinguished Italian audience, including King Vittorio Emanuele, was told that Professor Enrico Fermi, theoretical and experimental physicist of the University of Rome, had artificially created a chemical element heavier than uranium...
...standard table of elements lists 92-from hydrogen, the lightest element, to uranium, the heaviest. An atom of hydrogen has one positive charge on the nucleus and one planetary electron; uranium has a positive nuclear charge of 92, and 92 attendant electrons. The existence of all these elements has been well established, except for Nos. 85 and 87 (alabamine and virginium),† whose discovery has been claimed by various investigators but not yet certainly confirmed. The existence of elements heavier than uranium is theoretically possible. In fact, such heavy elements of higher numbers than 92 are supposed to exist...
...Italy's brilliant Enrico Fermi produced tiny, short-lived quantities of ekarhenium and ekaosmium (Nos. 93 and 94) by bombarding uranium with neutrons. These new substances were entirely synthetic, however, like the many synthetic, artificially radioactive elements which physicists have brought to birth by similar bombardments (TIME...
Ordinary lead's peculiar isotope distribution dates back millions of years and was probably caused by the early "contamination" of ordinary lead in its active elements uranium and thorium, Dr. Nier believes. This theory has yet to be thoroughly investigated...
Ordinary lead, which has the isotopes 204, 206, 207, and 208, is the only lead to have the isotope 204; uranium lead is in two isotopes, 206, and 207; and thorium ends up in a lead of only one form, weighing 208 units...