Question

how to find the valency of flourine and oxygen and carbon with step plz

Answer 1

First write electronic configuration.

Flourine = 1s2 , 2s2, 2p5
it requires 1 electron to complete it octate or to still stable
so valency = 1
valency electron = 7 (number of electron present in last orbit)

oxygen = 1s2 , 2s2 , 2p4
it requires 2 electron to complete it octate or to still stable
so valency = 2
valency electron = 6 (electron present in last orbit)

carbon = 1s2 , 2s2 , 2p2
it requires 4 electron to complete it octate or to still stable
so valency = 4
valency electron = 4