Question

Fluorine (F) atomic number 9 and chlorine (Cl) atomic number = 17 are placed in group number 17, what are the number of valence electrons present in them.

Answer 1

Answer:

F=7 & CL=7

Explanation:

In Flourine ,no. of valence electrons=7

because Electronic configuration=2,7

(2+7=9).

ln chlorine ,no. of valence electrons=7

because Electronic configuration=2,8,7

(2+8+7=17).

Hope it may help you.