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Question

The number of elements that do not have completely filled d subshell among the elements Ni,Pd,Pt,Cu,Ag,Au,Zn,Cd and Hg are

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Solution

Elements Atomic number Electronic configuration d-orbital
Ni 28 [Ar]3d84s2 Incomplete
Pd 46 [Kr]4d10 Fully filled
Pt 78 [Xe]4f145d96s1 Incomplete
Cu 29 [Ar]3d104s1 Fully filled
Ag 47 [Kr]4d105s1 Fully filled
Au 79 [Xe]4f145d106s1 Fully filled
Zn 30 [Ar]3d104s2 Fully filled
Cd 48 [Kr]4d105s2 Fully filled
Hg 80 [Xe]4f145d106s2 Fully filled

Hence, answer is 2.

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