THE work of Aston has shown that potassium, which has an atomic weight of 39·104 (Hönigschmid), is a mixture of two isotopes. The atomic masses of these are 39 and 41, and they are present in ordinary ...
CAREFUL determinations have been made of the atomic weight of calcium extracted from two very old potassium-rich deposits—one a felspar from Rhiconich, Sutherlandshire, estimated at 1,000 million ...
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