Question

explain the term variable valency. copper having electronic configuration 2 8 18 1 exhibit variable valency give reason for the same and name the compound cucl2 and cucl2. ​

Answer 1

Explanation:

Variable valency is the property of transition metals in which they have multiple valencies and so they can react in different proportions with the same element. Copper having electronic configuration 2 8 18 1 exhibits valency +1 because it has only one electron in its outermost shell or orbit and donates this one electron to become stable, so it has positive valency. CuCl2 is Copper(II)chloride. Because Copper has variable valency it forms another compound CuCl which is Copper(I)chloride.