Question

What is the formal charge on the sulfur atom in sulfur trioxide SO3?

Answer 1

SO3 belongs to the D3h point group. In terms of electron-counting formalism, thesulfur atom has an oxidation state of +6 and a formal charge of 0. The Lewis structure consists of an S=O double bond and two S–O dative bonds without utilizing d-orbitals. The electrical dipole moment of gaseous sulfur trioxide is zero.

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