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

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

NTA AbhyasNTA Abhyas 2022

Solution:

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