Complete and balance the half-reaction in acidic solution

Question

S2O3^2- (aq)------->S4O6^2-(aq)

Answer 1

S₂O₃^2- ==> S₄O₆^2- ... oxidation half reaction

2S₂O₃^2- ==> S₄O₆^2- ... balanced for S and O

2S₂O₃^2- ==> S₄O₆^2- + 2e- ... balanced for mass and charge = fully balanced oxidation half reaction

(note: acid is not required for this half reaction. It would be required for the reduction half reaction of BiO₃^- =>Bi³⁺)