The Occurrence of Dwi-Manganese in Manganese Salts

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FROM our respective communications (NATURE, vol. 116, p. 782; Chem. News, vol. 131, p. 273, etc., 1925) it was apparent that, although working on different lines, we had detected the element of At. No. 75 in manganese salts. A sample brought by one of us to Prague has been examined in the laboratories of the Charles' University. The sample was obtained from a solution of “pure manganese sulphate” by removing as much manganese as possible with hydrogen sulphide. When examined polarographically and also spectroscopically, it showed a similar content of dwi-manganese, namely, one percent. The chemical properties of this mixture agreed with those previously announced from this University. Since we have reached the same conclusion by independent chemical and electrochemical methods, we consider the association of dwi-manganese with manganese as proved, and thus regard the name dwi-manganese (D) as most appropriate for the element At. No. 75.

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