Formal charge: an accounting tool
Formal charge helps compare Lewis structures. It is not a direct measurement of the real local charge carried by an atom.
Core idea
Formal charge helps compare Lewis structures. It is not a direct measurement of the real local charge carried by an atom.
Example
Across several possible structures, minimizing formal charges and placing negative charges on more electronegative atoms can help, but it is not the only consideration.
Common trap
A formula or trend is useful only when its definition and conditions of use are clear.
Check yourself
Explain the phenomenon in your own words, then identify which quantity or mechanism you would use to quantify it.
Across several possible structures, minimizing formal charges and placing negative charges on more electronegative atoms can help, but it is not the only consideration.