Question

how are the element with variable valency named with an example

Answer 1

oxygen
nitrogen.....

Answer 2

yeah sure for your help

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your answer is A element with variable valency is nothing but a elements who crossed bohr's law have might be a variable valency in class 12 th you read about those because we all know that only noble gas stable that's why we mentioned all noble gas valency is zero .

example : Oxygen and nitrogen

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hope you satisfied with my answer please