Answer : This element belongs to the member of halogen group(group 17).
Explanation :
The valence-shell electronic configuration is [tex]ns_2np_5[/tex]
in this electronic configuration we see that there are 7 valence electrons in the element.
In the periodic table, Halogen is the group which has 7 valence electrons.
The element in halogen group are Florine, chlorine, bromine, iodine and astatine.
Dark shaded region is the halogen group(group 17)
The image of periodic table is shown below.
