Quarterly journal . omic weights.^ In order to pre-serve the form of the periodic classification, let us stop afterflourine, and begin a second line with neon. The same abscissaare preserved, and a constant whole number is subtracted fromthe atomic weights of the second row. We thus get a row ofelements that do not come exactly beneath their with potassium, the third row is placed the samedistance beneath the second, and plotted by subtracting a largerconstant. This can be continued until the table is a table was suggested eleven years ago by Prof. T.
Quarterly journal . omic weights.^ In order to pre-serve the form of the periodic classification, let us stop afterflourine, and begin a second line with neon. The same abscissaare preserved, and a constant whole number is subtracted fromthe atomic weights of the second row. We thus get a row ofelements that do not come exactly beneath their with potassium, the third row is placed the samedistance beneath the second, and plotted by subtracting a largerconstant. This can be continued until the table is a table was suggested eleven years ago by Prof. T. , in the course of a series of lectures at Harvard Uni-versity, but the subject was not carried out beyond an outline. * Presented in abstract at the Minneapolis meeting of the American ChemicaSociety. 1 Chemical Publishing Company, 1906. 2 All atomic weights used in this paper are taken from the Report of the Inter-national Committee on Atomic Weights for 1911. 174 Periodic Classification of the Elements \ 175. 176 The Quarterly Journal The constants may be chosen in one of two ways. One groupmay be chosen as a standard, and the constants so selected thatall of its members come on practically a vertical line. This willmake the table depend on one group and all the other groupswill be shown as related to it. A fairer way is to take the aver-age difference between rows as the constant to be has been done in the table shown, where 17 is subtractedfrom the atomic weights of the members of the second row,17 plus 19 from the third, 17 plus 19 plus 24 from the fourth, andso on. In this table the members of each group have been connectedby two branching lines. The members of ro vs i, 2, 3, 5, 7, 9,form one branch, and of rows I, 2, 4, 6, 10, the other. Thisseems to connect the best related families, and combines theadvantages of the classification by great and by small of the elements of the cerium group are not included in thefamilies. Group O has bu
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