в порядке усиления основных свойств оксиды расположены в ряду
1)Na2O-MgO-Al2O3-SiO2
2)K2O-Cu2O-Rb2O-Ag2O
3)Rb2O-Cs2O-SrO-BaO
4)CaO-K2O-Rb2O-Cs2O
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