Określ stopnie utleniania pierwiastków chemicznych w: HBr, Al2S3, SiO2, Cr2O72-
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HBr - H: I, Br: -I
Al₂S₃ - Al: III, S: -II
SiO₂ - Si: IV, O: -II
Cr₂O₇²⁻ - Cr: VI, O: -II