Final answer:
The proper Lewis structure for CH3 is a central carbon atom bonded to 3 oxygen atoms, each with 3 lone pairs of electrons. The structure with negative formal charges on more electronegative atoms is preferable.
Step-by-step explanation:
The proper Lewis structure for CH3 is as follows:
- There is a central carbon atom bonded to 3 oxygen atoms. Each oxygen has 3 lone pairs of electrons. The molecule has a charge of -2 and is placed inside square brackets.
- The structure with the negative formal charges on the more electronegative atoms is preferable when choosing among several Lewis structures with similar distributions of formal charges.