why Zn,Cd,Hg are known as pseudo transition elements?

Transition elements are those which have incompletely filled d orbitals in their ground state or any one of their oxidation states. But Zn, Cd and Hg have full d10 configuration in their ground state as well as in their common oxidation states. That is why, they are not regarded as transition elements, and so are also called pseudo transition elements.

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