Obsessed with a treasure city, conquistador Francisco Pizarro captured the Inca emperor Atahualpa. To spare his life, the emperor offered up the largest cache of gold the Spanish ever acquired in the ...
IN 1937, Perrier and Segrè showed that radioactive isotopes of element 43 could be formed by neutron or deuteron bombardment of molybdenum 1. Several chemical properties of element 43 were established ...
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