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Question

Draw the Lewis structure for SO32⁻. How many equivalent resonance structures can be drawn?

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Bob

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Solution By Steps

Step 1: Lewis Structure of SO32⁻

To draw the Lewis structure of SO32⁻, we first calculate the total number of valence electrons. Sulfur contributes 6, each oxygen contributes 6, and the negative charge adds 1 electron. This gives us a total of 6 (S) + 3(6) (O) + 1 (charge) = 24 valence electrons.

Step 2: Lewis Structure of SO32⁻

Place the least electronegative atom (Sulfur) in the center. Connect each oxygen to the sulfur with a single bond. Distribute the remaining electrons around the atoms to satisfy the octet rule. Sulfur should have 12 electrons around it (including bonding pairs).

Step 3: Lewis Structure of SO32⁻

After distributing the electrons, you may find that sulfur does not have an octet. To remedy this, form double or triple bonds between sulfur and one or more oxygen atoms until sulfur has an octet.

Step 4: Equivalent Resonance Structures

For SO32⁻, there are 3 equivalent resonance structures that can be drawn by moving the double bond around the sulfur and oxygen atoms.

Final Answer

Lewis structure of SO32⁻ with 3 equivalent resonance structures.

Key Concept

Resonance

Key Concept Explanation

Resonance in chemistry refers to the concept where multiple Lewis structures can be drawn for a molecule by moving electrons around to form different bonding arrangements. These resonance structures do not represent different molecules but rather contribute to the overall structure and properties of the compound.

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