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chem: add formal charge

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eggy 2020-10-08 22:00:38 -04:00
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@ -311,6 +311,20 @@ Sometimes, one atom in a covalent bond may contribute both electrons in a shared
## 4.3 - Covalent structures
### Formal charge
There may be several correct ways to draw covalent bonds in Lewis structures and dot diagrams. Solving for the **formal charge** of each atom involved in a covalent bond can help identify the **best** structure to construct. The formal charge of an atom in a covalent bond represents the charge that that atom has. The sum of all formal charges in a covalently bonded compound is equal to the charge of the overall compound.
The formal charge of an atom can be calculated using the following equation:
$$\text{Formal charge} = \text{# of valence electrons of element} - \text{# of unpaired electrons} - \text{# of covalent bonds}$$
To find the best structure for a covalently bonded compound, the formal charge of all atoms in that compound should be **minimised**.
!!! warning
Some elements want formal charges of zero so much that they break the octet rule. These elements are $\text{P, S, Cl, Br, I, and Xe}$. To do so, they will accept **dative covalent bonds** from other atoms with opposite formal charges. This brings the formal charges of both atoms closer to zero by one.
### Resonance structures
## 4.4 - Intermolecular forces
## 4.5 - Metallic bonding