# What is the oxidation number of sulfur in magnesium sulfate?

In sulfate? $S \left(V I +\right)$.
Sulfur in the sulfate ion achieves the group oxidation number: i.e.${S}_{O N} = \left(- 2 - 4 \times - 2\right) = - 2 - \left(- 8\right) = + 6$.
Can you tell me the oxidation number of the sulfurs in thiosulfate, S_2O_3^(2-)?