A metal has electronic configuration `[Ar]^(18)3d^7 4s^2`.On the basis of this electronic configuration find out the group number.

Answer

9

Explanation

Last electron enter in d-subshell so it belongs to d-block elements.
For d-block elements group number
=no of electrons in (n-1)d subshell+number of electrons in valence shell (i.e. ns)
=7+2=9