IB Chemistry HL 2.2.14 Formal Charge and Resonance Question Bank

Calculate formal charge consistently, compare resonance contributors, and justify the preferred structure from charge placement.

Exam points

assign formal charge from valence, nonbonding and bonding electrons
compare valid resonance contributors using charge separation and octet completion
use charge distribution to justify the preferred Lewis representation

[Maximum number: 1]

Sulfur trioxide is an important compound in industry.

Sulfur trioxide has more than one possible Lewis (electron dot) structure.

State how chemists decide which Lewis (electron dot) structure is more stable.

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