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For H2SO4 we have a total of 32 valence electrons. Put a pair between the atoms. We're forming chemical bonds here. We've used 8, 10, 12, and then around the outside to fill the octets on the Oxygens, 14, and 32.So this looks like a pretty good Lewis structure for H2SO4. In the H 2 SO 4 Lewis structure Sulfur is least electron electronegative atom and goes in the center of the Lewis structure. 2  When we have an H (or H2) in front of a polyatomic molecule (like CO 3, SO 4, NO 2, etc.) we know that it's an acid.
Answers. Best Answer: My answers were: S in H2SO3 is 4+ S in MgSO4 is 6+ and S in K2S is 2- For the first one, hydrogen has an oxidation number of 1+ per atom. There are 2 hydrogen atoms in that compound so the overall charge of hydrogen is 2+. The oxidation number of oxygen is 2- per atom, and having 3 atoms of oxygen the overall charge of oxygen is 6- so combine the charges.