Question

write short note on variable valency​

Answer 1

Answer:

Certain elements combine with other atoms, donating, accepting or sharing electrons in different proportions depending on the nature of the reaction. For example, iron combines with oxygen to form ferrous oxide as well as ferric oxide. This is termed variable valency.

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Answer 2

Some elements possess more than one valence. Such elements are said to possess variable valency. For example, iron has two electrons in its outermost shell (valence shell). On donating these electrons, its valency becomes 2.

Sometimes, same element may exhibit one valency in one compound and another valency in other compound. This property is called as variable valency.

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