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Elements in which last electron enters in d orbitals are known as d-block elements.
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All transition elements are d block elements and have unpaired d-orbital electron/s either in their ground state or in any stable excited state.
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For some d-block elements like Zn, Cd, and Hg, the ground state or stable excited state lacks unpaired electron in d-orbital.
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So, these elements do not show most of the properties of transition element. Thus, on the basis of electronic configuration, all d block elements such as Zn, Cd and Hg are not the transition elements.
