The valency of sulphur in sulphur hexa fluoride is ________ .
What is the valency of :
(a) fluorine in CaF2 (b) sulphur in SF6
(c) phosphorus in PH3 (d) carbon in CH4
During a chemical reaction, it was found that Sulphur Trioxide was released. The valency of Sulphur in the compound is ___ .