Abstract

As the International Committee on Atomic Weights has not provided a table since 1921, the British Sub-Committee published in the Journal of the Chemical Society of January last a revised table of atomic weights for 1929. In the report attached to this table we read that “for the nine ‘simple’ elements H, He, C, N, F, Na, P, As, and I the values obtained by F. W. Aston with his new mass-spectrograph are adopted in preference to those deduced from the physical or chemical data, because we are of opinion that, in these cases, Aston's method is less liable to error than any other”.…

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