Предмет: Химия, автор: sk62711001

А) О Б)СІ B) Na Г) Ва сполуці С₂O- 4. Укажіть хімічний елемент зі змінною валентністю​

Ответы

Автор ответа: hynchakvasya
4

Ответ:

А) О (оксиген)

Б) S (сірка)

В) Na (натрій)

Г) Ва (барій)

С₂O₄- (оксалат) - це йон, а не хімічний елемент.

Хімічні елементи зі змінною валентністю включають перехідні метали, наприклад, залізо (Fe), хром (Cr), марганець (Mn) тощо.

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