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https://www.matematicus.ru/publ/gdz/gdz_po_khimii_dlja_8_klassov/9_izmenenie_chisla_ehlektronov_na_vneshnem_ehnergeticheskom_urovne_atomov_khimicheskikh_ehlementov/95-1-0-2524 | 100% | Monthly | 2019-02-14 17:33 |