Answer: The correct answer is Option A.
Explanation:
Elements that are present in Group 17 are Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I) and Astatine (At).
The general electronic configuration for these elements are:
[tex]\text{Group 17}=\text{[Noble gas]}ns^2np^5[/tex]
Where,
n = principle quantum number or the number of period to which the element belongs.
In the electronic configuration, the noble gas which is present in the proceeding period.
The valence electrons are defined as the number of electrons which are present in the outermost shell.
Number of valence electrons for this group are 7. In a period, the valence electrons remains constant.
Hence, the correct answer is Option A.
