What is the Lewis dot structure of CH2F2?

CH2F2 is a hydrofluorocarbon. If you put the carbon in the middle and put one valence electron each on the left, right, top, and bottom, then bond the H's and F's to each of those four sides, you will find that your Lewis structure works. Remember, H has 1 valence electron and F has 7. Carbon will need to share to get 8, along with the fluorines. H only needs 2. All your bonds will be single covalent, with unshared electrons on the flouorine sides, making it a polar covalent molecule.