Ответ:
Al2O3: Al+3, O-2
k2s: k+1, s-2
OF2: O+2, F-1
H2CO3: H+1, C+4, O-2
H3PO4: H+1, P+5, O-2
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Ответ:
Al2O3: Al+3, O-2
k2s: k+1, s-2
OF2: O+2, F-1
H2CO3: H+1, C+4, O-2
H3PO4: H+1, P+5, O-2