What is variable valency ? Give two examples of elements showing variable valency.
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Some elements possess more than one valence. Such elements are said to possess variable valency. For example:
(i) iron has two electrons in its outermost shell (valence shell). On donating these electrons, its valency becomes 2.
(ii) in ferrous oxide valency of iron is +2, whereas in ferric oxide valency of iron is +3.
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Some elements have different capacities to combine with different elements. This depends on the nature of reaction. This property of having different capacity to combine with different elements is called variable valency. For example in ferrous oxide valency of iron is +2, whereas in ferric oxide valency of iron is +3.
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