Word: thorium
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Dates: during 1921-1921
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...from radium minerals is supposed to come from the decomposition of radium. Why its atomic weight is different from that of ordinary lead, whether ordinary lead may not itself prove to be a mixture of lighter lead with a heavier variety, perhaps due to the disintegration of the element thorium, and whether other elements, hitherto supposed to be final and invisible, may not also prove to be mixtures and thus open up a whole series of new problems as to the composition of mater, are questions to which the answers are being eagerly sought all over the world today...