Why some elements have different valency for example :- Copper has atomic number 29 but it has two valency i.e 2,1.why such elements have more than two valency.Explain briefly.
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it is because it has variable valency of 2+ or 1+ , that is the reason it has been placed in transition metals . its atoms can either be arranged in the form of 2,8,18,1 and even in the form of 2,8,17,2.
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