According to the periodic table, it has 6 valance electrons in its outermost shell of an atom. so, the valancy must be 2.
we usually subtract the valancy from 8 to no. of electrons if no. of electrons in its outermost shell is more than 5.
is the valancy of sulpher here.
What are the two oxidation states of sulphur in sodium thiosulphate ? In thiosulphate, two sulphurs have oxidation state of -2 and +6. (as per suggestions). Sulphur bonded to three oxygen is considered to have +6 (Sulphur A) and other sulphur has -2 (Sulphur B).
The valency of sulphur in SO2 is 4.
Hope this helps..