s-Block ElementsHard

Question

Which is/are not correct configuration of s-block elements :

Options

A.[Ar] 3d10  4s2
B.[Ar] 3d10 4s1
C.[Ar]) 4s2
D.[Ar] 4s1

Solution

Configurations given in options (A) and (B) are of d-block elements as last electron enters in d-subshell.

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