Double Bonds
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Double Bonds
When drawing lewis structures, how do you know when to draw the double bond? and between which elements?
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Re: Double Bonds
If the formal charge on an atom is not equal to zero, that's a good indication that you will need a double bond at that location.
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Re: Double Bonds
To know when to use a double bond, you must find the formal charge by using the equation, FC = V - (L + S/2). When FC does not equal to 0, then you must use a double bond to make the FC equal to 0.
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Re: Double Bonds
Before considering formal charge, you usually use double bonds when you are trying to make every element satisfy the octet rule. So for example, if a compound has only 24 electrons and with your initial Lewis Structure with only single bonds you notice you are at 26 electrons, you would most likely use a double bond so the final electron count it 24 electrons.
You would then use formal charge to determine the best structure in case there are many potential options.
You would then use formal charge to determine the best structure in case there are many potential options.
Re: Double Bonds
you can tell by using the formal charge of an atom or reconfiguring the lewis structure if you do not have enough electrons to fully complete the lewis structure.
Re: Double Bonds
I agree with the person before me who suggested using double bonds first when you are trying to satisfy the octet rule after you have figured out how many total electrons belong in that molecule. After that, you can use double bonds to make the FC equal to 0 for resonance structures.
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