The article contains the description of the technique for determination of the atom diameters of chemical elements excluding the necessity of application of measurement instrumentation. Methodological bases of the research have been developed taking into account modern postulates of quantum mechanics and atom-molecular physics that the main kinds of the interaction between electrons and a nucleus in ion of a chemical element are electrostatic and centrifugal. On the basis of the analysis of known data about the electronic structure of chemical elements taking into consideration the electron and proton numbers in ions of the elements the laws about changing the values of ion coefficients for the ions of all chemical elements of the periodic table has been revealed and their numerical values have been determined. The calculated atom radiuses for the major part of the chemical elements are within the framework of the known data about their radiuses established previously.


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