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68 BOILING AND FREEZING POINT. chap, v
correspond with the simple formulse given. In this case it is evident that the valency changes by an uneven number. The same was later found to be the case with the chlorides of indium (24), Quite the greatest difficulties have arisen from the results of recent investigation, whereby it has been proved that in a solution of sodium chloride the chlorine and the sodium atoms exist for the most part as molecules. lu its old form the doctrine of valency is no longer tenable.
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