Okusinziira ku Dimitiri Mandeevu, singa erementi zonna ziba zisengekeddwa mu nziring’ana ey’obuzito bwazo, enzirng’ana ey’omugalamiro ey’ebinnyonnyozo yeyoreka. Kino kyalagibwa mu Etteeka ly’obugalamivu (law of periodicity)” okusinziira ku Dimitiri Mandeevu.