Выберите лишний элемент и объясните:

а) Na, K, Li, С

в) H2O, O2, F2, Сl2

б) Mg, С, N, F

г) НCl, HBr, HI, N2

д) H2O, Br2, CO2, MgO

е) H2S, NaF, Cu, CS2, KCl

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