Question

valency of fluorine in calcium fluoride

Answer 1

Valency of Fluorine is -1. There are two fluoride ions (anion) attached to one Calcium ion (di valent cation) ...

Answer 2

valency of fluorine in calcium fluoride.is
CaF2
here calcium has 2 as valency
here there are 2 fluorine atoms
let x be valency of fluorine
so,
2+2(x)=0
2(x)=-2
x=-2/2
x=-1
so valency of fluorine is -1