What is the hybridization of CH3F?

The hybridization the carbon atom in CH3F is sp3. We know this because of the tetrahedral arrangement of atoms around the carbon.

The fluorine atom is also sp3 hybridized. The single bond to carbon and the three lone pairs are four "electron groups" which are also tetrahedrally arranged around the F atom - but that is difficult to see from a Lewis structure.

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Edit, in August 2020: I have decided to answer questions like this one on a new site, www.lewis-structure.com. This molecule in particular was made into my first post, which is at http://lewis-structure.com/ch3f-lewis-structure-and-ch3f-hybridization/