...metals. out without a knowledge of the law of periodicity, and I will confine myself to simple substances and to oxides. Before the periodic law was formulated...merely call to mind that it compelled us to modify the valencies of imliiti» and cerium, and to assign to their compounds a different molecular composition....

...metals. out without a knowledge of the law of periodicity, and I will confine myself to simple substances and to oxides. Before the periodic law was formulated...merely call to mind that it compelled us to modify the valencies of indium and cerium, and to assign to their compounds a different molecular composition....

...substances and to oxides. Before the periodic law was formulated the atomic weights of the element* were purely empirical numbers, so that the magnitude...merely call to mind that it compelled us to modify the valencies of indium and cerium, and to assign to their compounds a different molecular composition....

...possessed by an atom, could only be tested by critically examining the methods of determination, bat never directly by considering the numerical values...merely call to mind that it compelled us to modify the valencies of indium and cerium, and to assign to their compounds a different molecular composition....

...live to mention their discovery to the Chemical Society of Great Britain as OF THE CHEMICAL ELEME'TS. a confirmation of the exactitude and the generality...merely call to mind that it compelled us to modify the valencies of indium and cerium, and to assign to their compounds a different molecular composition....

...value in substitution possessed by an atom) could only be tested by critically examining the method of determination, but never directly by considering...submit to the facts, instead of being masters of them. MENDELEEF, Faraday Lecture of the Chemical Society, 1889 The law of the periodicity of the elements,...