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Element with electronic configuration as `[Ar]^(18)3d^(5)4s^(2)` is placed in `:`A. `1^(st)`group, `s-` blockB. `2^(nd) ` group, `s-` blockC. `5^(th) ` group, `d-` blockD. `7^(th) ` group, `d-` block

Answer» Correct Answer - 4
Last electrons enters in `d-` orbital. So it belong to `d-` block. For `d-` block elements the group number is equal to the number of valence electrons `+` number of electrons in `(n-1)d` subshell `i.e., 2+5=7^(th)` group.


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