Question

Find the valency of F(9)
A) O
B) 1
C) 2
D) 3​

Answer 1

B) 1

The fluorine atom has 7 electrons in the outermost shell and its valency could be 7. But it is easier for fluorine to gain one electron instead of losing seven electrons. Hence, its valency is determined by subtracting seven electrons from the octet and this gives you a valency of one for fluorine.