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  4. Which of the following d-block elements have same configuration of (n-1) d subshell?

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Q. Which of the following d-block elements have same configuration of $(n-1)$ d subshell?

The d-and f-Block Elements

Solution:

Both elements belong to $3d$ series.

$Cu \to [ Ar ] 3 d ^{10} \,4 s ^{1}$

$Zn \to [ Ar ] 3 d ^{10} \,4 s ^{2}$

Same configuration of $( n -1) d$ subshell.