Question

What is the molecular geometry of \( \text{SO}_3 \)?

• A. Linear
• B. Trigonal planar
• C. Tetrahedral
• D. Octahedral

Hint:

Remember: A molecule with three bonding pairs and no lone pairs on the central atom has a trigonal planar geometry.

Answer 1

The Correct Option is B

Step 1: Determine the number of bonding and lone pairs on the central atom In \( \text{SO}_3 \), sulfur is the central atom. It is bonded to three oxygen atoms, and there are no lone pairs on the sulfur atom. The sulfur atom has 6 valence electrons, and the oxygen atoms each contribute 2 electrons. Thus, sulfur forms three double bonds with oxygen atoms. Step 2: Determine the molecular geometry Since there are three regions of electron density (three bonding pairs of electrons) and no lone pairs on the central sulfur atom, the molecular geometry is trigonal planar. Answer: Therefore, the molecular geometry of \( \text{SO}_3 \) is trigonal planar. So, the correct answer is option (2).