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Updated: May 6, 2025
Now as to valency or atomicity, accepting the received atomic weights of the elements, it is certain that there are at least four distinct types of hydrogen compounds represented by ClH, OH , NH , CH . The recognition of these types, and their relations to each other as types, was one of the most important and best assured advances made in theoretical chemistry.
So much as this, that only such unstable salts as I have just described, which decompose and yield precipitates by the action on them of alkalis, heat, the textile fibres themselves, or other agencies, are suitable to act as true mordants. Hence, generally, the sources or root substances of the best and most efficient mordants are the metals of high specific appetite or valency.
This leads us at once to the consideration that, in any given solution, all the ions possess individual charges equal in absolute value. The second law may be stated in these terms: an atom-gramme of metal carries with it into electrolysis a quantity of electricity proportionate to its valency.
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