<Li> The elements, if arranged according to their atomic mass, exhibit an apparent periodicity of properties . </Li> <Li> Elements which are similar as regards to their chemical properties have atomic weights which are either of nearly the same value (e.g., Pt, Ir, Os) or which increase regularly (e.g., K, Rb, Cs). </Li> <Li> The arrangement of the elements, or of groups of elements in the order of their atomic masses, corresponds to their so - called valencies, as well as, to some extent, to their distinctive chemical properties; as is apparent among other series in that of Li, Be, B, C, N, O, and F . </Li> <Li> The elements which are the most widely diffused have small atomic weights . </Li>

Who contributed properties to the greek periodic table