Let's do the Lewis structure for CH3Cl. Remember that Hydrogen (H) only needs 2 valence electrons for a full outer shell. Each of the atoms has a full outer shell. So we've used all 14 valence electrons. Transcript: This is Dr. B. Chlorine has 7 valence electrons. On the periodic table, Carbon group 4 or 14, 4 valence electrons. Carbon will go in the center. And Carbon also needs 8, which it has. And then Chlorine, which is very electronegative, also will go on the outside. Hydrogen's in group 1 but we've got 3 Hydrogens. We've used 8. Hydrogen's in group 1 but we've got 3 Hydrogens. On the periodic table, Carbon group 4 or 14, 4 valence electrons. Let's do the Lewis structure for CH3Cl. Hydrogens always go on the outside. We add them up, we get 14 total valence electrons. Hydrogens always go on the outside. We add them up, we get 14 total valence electrons. Chlorine has 7 valence electrons. We'll put 2 between each of the atoms to form a chemical bond. We have 14 valence electrons. Hydrogen only needs 2 valence electrons, so the Hydrogens are all OK. Chlorine needs 8, it has 8. And then around the Chlorine, 10, 12, 14 valence electrons. We're done with the Lewis structure for CH3Cl. Carbon will go in the center. About this Site | Report a Problem | Comments & Suggestions, Stoichiometry: Moles, Grams, and Chemical Reactions. Let's see if we have full outer shells. This is Dr. B., and thanks for watching.