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Zn, Cd, and Hg are not regarded as transition elements and why Uub is  regarded as transition elements

an element is said to be transition element if it has vacant d - orbitals or half-filled d orbitals.

Zn,Cd,Hg are not regarded as true transition metals as they donot have vacant d-orbital, rather they have fully filled d-orbital i.e. d orbital configuration.

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i think ,Uub is also having fully filled d orbital

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uub is not yet found. it is not an element yet.
When it'll be found maybe then it won't be considered a transition metal anymore,

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Zn,Cd,Hg though have completely filled d-orbital come under transition elements due to presence of an outermost d-orbital configuration

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they have completely filled d orbital !
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uub is not completely known but just it has its last e in d orbital so its known as transition metal whereas others have completely filled d orbital
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Bcoz it has fully filled d-orbitals
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because there elements have completely filled d-orbital
and transition elements have partially filled d-orbital
 
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Zn, Cd ,hg are not considered as transition elements because they do not have partially filled d orbital either in ground state or any stable oxidation state
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