August 2022 2 12 Report
В одном из ОКСИДОВ марганец проявляет валентность, равную четырём. Его химическая формула 1 )MnO 2) МnO₂ 3) Мn₂O₇ . Напишите пожалуйста, как определить валентность в каждом оксиде.
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