Question

Which element in the given below does not show variable valency?

• A. $Zn$
• B. $Cu$
• C. $Ni$
• D. $Mn$

Answer 1

Answer: (A)

The electronic configuration of $Zn$ is $(Ar)3d^{10}4s^2$ . Hence due to complete d-subshell, it does not show variable valency.