drawing a lewis dot structure
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Drawing a Lewis Dot StructureTRANSCRIPT
Drawing a Lewis Dot Structure Chem I Draw the Lewis structure for iodomethane, CH3I
1. Determine the type and number of atoms in the molecule. 1 carbon atom, 3 hydrogen atoms, and 1 iodine atom
2. Write the electron-‐‑do notation for each type of atom in the molecule.
3. Determine the total number of valence electrons available in the atoms to be counted.
C 1 x 4e-‐‑ = 4e-‐‑ I 1 x 7e-‐‑ = 7e-‐‑ 3H 3 x 1e-‐‑ = 3e-‐‑ 14e-‐‑
4. Arrange the atoms to form a skeleton structure for the molecule. If carbon is
present, it is the central atom. Otherwise, the least-‐‑electronegative atom is central (except hydrogen). Then connect the atoms by electron-‐‑pair bonds.
5. Add unshared pairs of electrons to each nonmetal atom (except hydrogen)
such that each is surrounded by eight electrons.
6. Count the electrons in the structure to be sure that the number of valence electrons used equals the number available. Be sure the central atom and other atoms besides hydrogen have an octet.
Now you try. Draw lewis dot structures for the following molecules: H2 F2 Cl2 N2 O2 NH3 H2O CO2 CH4 C2H2 C2H4 CS2 CCl4 HF H2S NI3 H2Se O3 HCN C2HCl