October 2021 1 19 Report
Составьте формулы:
 а) оксидов перечисленных элементов: Pb(+4), Na(+1),Ba(+2);          
    б ) сульфидов элементов: Sr(+2), Ag(+1),Hg(+2) . в скобках указаны степени окисления атомов в данных соединениях
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