Answer:
[tex]ns^2np^5[/tex]
Explanation:
Halogen group:This group contains Cl,F,Br and I
There are 7 electrons in the outermost shell of each element of halogen family.
Each element of this family required one electron to fill their complete outermost shell.
We know that
[tex]F=9=1s^22s^22p^5[/tex]
Cl=17=[tex]1s^22s^22p^63s^23p^5[/tex]
Therefore, the general configuration for atoms of the halogen group is given by
[tex]ns^2np^5[/tex]
