%0 Journal Article %T ACCOUNTING FOR THE HARD-SOFT PROPERTIES OF CHALCOGEN ATOMS IN THE DEVELOPMENT OF NEW EXTRACTANTS AND SORBENTS FOR HEAVY METAL COMPOUNDS %A Nalibaeva, A.M. %A Abdikalykov, E.N. %A Ilyassova, O.S. %K heavy metal ions, extraction from solutions, Pearson's theory %J Modern Technologies and Scientific and Technological Progress %D 2026 %N 2026 %P 1 %I Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»