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Question

How many elements from the following are not transition element?
Zn,Co,Cd,Hg,Au,Cu


Solution

The electronic configuration of 
Zn=[Ar]3d104s2
Co=[Ar]3d74s2
Cd=[Kr]4d105s2
Hg=[Xe]4f145d106s2
Au=[Xe]4f145d106s1
Cu=[Ar]3d104s1

Transition metals or elements are those which can form one or more ions having incompletely filled d- orbitals 

Cu2+, Co2+, Au3+ these all have incompletely filled d- orbitals.Thus these are transition elements.

But Zn, Cd and Hg are not transition elements.
 

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