摘要 : Problems connected with the long version of atom-based Periodic System of chemical elements with arbitrary 1-18 group numbering recommended by IUPAC are discussed.Introducing the atomic cores of elements instead of atoms to the Pe... 展开 Problems connected with the long version of atom-based Periodic System of chemical elements with arbitrary 1-18 group numbering recommended by IUPAC are discussed.Introducing the atomic cores of elements instead of atoms to the Periodic Table enables to define unequivocally the Periodic System as a triparametric classification resulting from three numbers:the number of core electron shells n,the core charge q,and the number of valence subshells l.The core based periodic chart is free of any imperfections and limitations of the atom based system and it enables reasonable numeration of groups and periods according to the nql parameters. 收起