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).
My actual qus. is that sulphur A is connected to three oxygen and it should be more electronegative than sulphur B. So, how can sulphur B attracts two electrons from the sulphur A and getting negatively charged.