Question

why some elements exhibit the variable valency?? write with example
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Answer 1

Answer:

Some elements differ in their capacity to combine with other elements depending on the nature of the reaction; this property is called variable valency..

one or more electrons from the core's outermost shell may also be lost after the removal of valence electrons. Such elements therefore indicate two or more different valencies

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Answer 2

Answer:

Some elements show variable balance because of their different electronic centrifugations. An atom of an element can sometimes lose more electrons than are present in balance shell i.e, lose from the penultimate shell and hence exhibit more than 1 or variable valency. For example copper, tin iron and mercury have variable valency.

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