How to Calculate the Formal Charges for SO3 2- (Sulfite ion)
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In order to calculate the
In order to calculate the formal charges for SO3 2- we'll use the equation:
Formal charge = [# of valence electrons] - [nonbonding val electrons] - [bonding electrons / 2]
The number of valence electrons for the atom of interest is found on the Periodic Table.
Nonbonding valence electrons are those around the atom of interest that are not involved in chemical bonds (they aren't being shared with another atom).
Bonding valence electrons are the ones shared between atoms. We'll divide this number by two.
We find these from the Lewis Structure for SO3 2-.
How to draw the SO3 2- Lewis Structure:
Some things to note about SO3 2- Formal Charges:
- Formal charge is different from the oxidation number!
- If you can exceed the octet rule for the central atom it's a good idea to check the formal charges.
- If we have isomers or resonance -- formal charges will help us determine most stable structure.
- The closer the formal charges are to zero the more likely we have the most favorable Lewis structure for the molecule.
- We write the formal charges in (). E.g. (-1)
Helpful Videos:
• Formal Charges: Formal Charges: Calculating Formal Ch...
• Finding Valence Electrons (element): Finding the Number of Valence Electro...
• Exceptions to the Octet Rule: Exceptions to the Octet Rule
• How to Draw Lewis Structures: How to Draw Lewis Structures: Five Ea...
• Practice Lewis Playlist: Lewis Structures Practice Problems wi...
For more help with chemical bonding and formal charge visit http://www.Breslyn.org
Formal charge = [# of valence electrons] - [nonbonding val electrons] - [bonding electrons / 2]
The number of valence electrons for the atom of interest is found on the Periodic Table.
Nonbonding valence electrons are those around the atom of interest that are not involved in chemical bonds (they aren't being shared with another atom).
Bonding valence electrons are the ones shared between atoms. We'll divide this number by two.
We find these from the Lewis Structure for SO3 2-.
How to draw the SO3 2- Lewis Structure:
Some things to note about SO3 2- Formal Charges:
- Formal charge is different from the oxidation number!
- If you can exceed the octet rule for the central atom it's a good idea to check the formal charges.
- If we have isomers or resonance -- formal charges will help us determine most stable structure.
- The closer the formal charges are to zero the more likely we have the most favorable Lewis structure for the molecule.
- We write the formal charges in (). E.g. (-1)
Helpful Videos:
• Formal Charges: Formal Charges: Calculating Formal Ch...
• Finding Valence Electrons (element): Finding the Number of Valence Electro...
• Exceptions to the Octet Rule: Exceptions to the Octet Rule
• How to Draw Lewis Structures: How to Draw Lewis Structures: Five Ea...
• Practice Lewis Playlist: Lewis Structures Practice Problems wi...
For more help with chemical bonding and formal charge visit http://www.Breslyn.org
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