2. Определите валентность каждого химического элемента в молекулярной формуле вещества: KH, CaH2, AlH3, CH4, K2O, CuO, I2O7, Fe2O3, As2O5, SiO2, FeBr3, Cr2S3, FeN, Ba2C, SCl4, N2Se3, PBr5, Zn3P2, SnTe2, C3N4, HNO2, HClO3, H2CrO4, HIO2, H2SiO3, H3BO3, Al(OH)3, H3SbO4, H3PO2, C6H12O6 Постройте структурные формулы веществ: As2O5, SiO2, FeN, N2Se3, C3N4(*), H2CrO4, H3BO3, H3PO2

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