The atomic weight of lead from samarskite
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Text from page 1: In the disintegration of the radioactive elements, since each a-transformation involves the loss of an atom of helium and nothing else which in weighable, the atomic weight of the product should be just 3.99 less than that of the origianl substance, since 3.99 is the atomic weight of the helium evolved during the a-transformation. Thus if radium has an atomic weight of 225.97, radium emanation, the result of the loss of one a-particle, should have an atomic weight of 221.98; radium D, involving the loss of three more a-particles, should be 210.01; and radium G, yet another a-transformation, hsould be 206.02.
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