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R-O-SO3-
Four electron groups - two bonded pairs and two lone pairs
It has 4
If you mean SO3^-2 (the sulfite anion), then S has an oxidation number of 4+, since each O atom is 2-. In sulfur trioxide, SO3, the S atom has an oxidation number of 6+.
2 electron groups are in CO2. Proof, I got it wrong on a quiz. :(
linear
SO3 is the chemical formula for sulfur trioxide.
Formula: SO3
Electron geometry for this is tetrahedral. There are two O-F single bonds, which makes 2 electron groups. There are two lone pairs around oxygen, which make up the last two electron groups. Molecules with four electron groups has a tetrahedral Electron geometry.
tetrahedral
180°
-2 for each O +6 for S