Element with electronic configuration as `[Ar]^(18)d^(5)4s^(2)` is placed in `:`

Options

A. `1^(st)` group , `s-` block
B. `2^(nd)` group, `s-` block
C. `5^(th)` group, `d-` block
D. `7^(th)` group, `d-` block

Answer

4

Explanation

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.