Number of valence electrons in Cl- ion are : (a) 16 (b) 8 (c) 17 (d) 18

Q.17:- Number of valence electrons in Cl- ion are :
(a) 16
(b) 8
(c) 17
(d) 18

 

Answer:-

(b) Electronic configuration of Cl (Z = 17) = 2,8,7. Thus, it has 7 valence electrons. Cl  gains 1 electron to form Cl ion. So, number of valence electrons =7+1=8.