August 2022 1 10 Report
Определите валентность атомов элементов в соединениях с кислорода, зная, что он двухвалентный: SO2, K2O, Cr2O3, P2O5, BaO, SO3, Cl2O7. Определите соединение, в котором валентность соединенного с кислорода элемента самая высокая и самая низкая.
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