Сколько электронов отдано ионами при следующих превращениях?
а)S-2 - ?ē ® S° г)S-2 - ?ē ® S+6
б)Mn+2 -?ē ® Mn+6 Д)Mn+2 - ?ē ® Mn+7
в)N+2 - ?ē ® N+5
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