Answer and Explanation:
In SO3, sulfur is the central atom and is bonded to three oxygen atoms.
To determine the hybridization of the central atom in SO3, we first need to count the number of electron groups around the sulfur atom. An electron group can be a lone pair of electrons or a bond (single, double or triple bond) to another atom.
In SO3, the sulfur atom is bonded to three oxygen atoms, and there are no lone pairs on the sulfur atom. Therefore, the total number of electron groups around the sulfur atom is 3.
The hybridization of the central atom in SO3 is sp2. This means that the sulfur atom has three hybrid orbitals that are involved in bonding with the oxygen atoms.
The bond angle in SO3 is approximately 120 degrees. This is because the three oxygen atoms are arranged symmetrically around the central sulfur atom, with each bond angle at 120 degrees.