We are being asked to identify the resonance forms that describe the distribution of electrons in sulfur dioxide, SO2.
We will have to draw the Lewis Structure of SO2 first.
Step 1: Determine the central atom in this molecule.
• S is less electronegative than O (S and O have the same group and electronegativity decreases going down the periodic table).
• S is the central atom and is bonded to 2 O atoms
Step 2: Calculate the total number of valence electrons present.
Group Valence Electrons
S 6A 6 valence e‑ x 1
O 6A 6 valence e- x 2
Total = 18 valence e-
Step 3: Draw the Lewis Structure for the molecule
• O → prefers to have complete octet (8 e- around them)
• S → can exceed octet rule (more than 8 e- around them)
Write resonance forms that describe the distribution of electrons in each of these molecules or ions.
sulfur dioxide, SO2
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