What is the Structure of Na2S4O6?Hence what is the Oxidtion no. of S atoms?

Hi

The tetrathionate anion, S₄O₆²⁻, is a sulfur oxoanion derived from the compound tetrathionic acid, H₂S₄O₆. Two of the sulfur atoms present in the ion are in oxidation state 0 and two are in oxidation state +5. Alternatively, the compound can be viewed as the adduct resulting from the binding of the Lewis base S₂²⁻ to SO₃. Tetrathionate is one of the polythionates, a family of anions with the formula [S_n(SO₃)₂]²⁻.

Tetrathionate's structure can be visualized as following three edges of a cube,. The structure of S₄O₆²⁻ in BaS₄O₆·2H₂O and Na₂S₄O₆·2H₂O. Dihedral S-S-S angles approaching 90° are common in polysulfides.