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Lapatulllka [165]
3 years ago
10

How can you use formal charge to determine a) when an atom should be electron deficient or b) when an atom should have an expand

ed octet in a Lewis Structure.
Chemistry
1 answer:
mash [69]3 years ago
5 0

Answer:

Using the Formula Fc = (Valence Electrons) - (Unbound Electrons) - (N bonds in the atom)

Explanation:

Concept: Formal Charge

Let's remember the concept of formal charge as the electric charge of an atom in a given molecule, it is calculated as it follows:

Fc = (Valence Electrons) - (Unbound Electrons) - (N bonds in the atom)

So to answer the question and by knowing the molecule, we can tell

a) Fc + Unbound Electrons + N Bonds of the atom = Valence Electrons, if the valence electrons are fewer than the actual electrons of the atom, it means it is missing electrons.

b) let' s remember the concept of expanded octet as an atom and the Lewis Structure having more than 8 electrons.

So if you sum the Valence Electrons and the N bonds in the atom multiplied by two (There are two electrons in 1 bond) and this number is greater than 8, you could say it has an expanded octet

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<em></em>

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