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Drawing Lewis Structures

1 C atom in CCl 4. 4 Cl atoms in CCl 4. Drawing Lewis Structures. Example 1 - C Cl 4. Step 1 - Determine the total # of valence shell electrons (e 1- ) used. C is in group 4, Cl is in group VII ((4x 1) + (7x4)) = 32 e 1-.

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Drawing Lewis Structures

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  1. 1 C atom in CCl4 4 Cl atoms in CCl4 Drawing Lewis Structures Example 1 - CCl4 Step 1 - Determine the total # of valence shell electrons (e1-) used. C is in group 4, Cl is in group VII ((4x 1) + (7x4)) = 32 e1-

  2. Step 2 - Place the single atom of C in the centre and place the 4 Cl atoms around it. Cl C Cl Cl Cl

  3. Cl C Cl Cl Cl Step 3- Place a pair of electrons between each pair of atoms.

  4. Cl C Cl Cl Cl Step 4 - Place 8 electrons around all non-central atoms.

  5. I I I I Step 5 - If there are any electrons left, place them, in pairs, around the central atom . Example - In the case of SI4 after going through steps 1 - 4 you get: Step 2 Step3 Step 5 Step 1 # of e1- is: 6 x 1 + 4 x 7 = 34 S Step4

  6. Step 6 - If the central atom is in group 4, 5, 6, 7 or 8 the octet rule (rule of 8) must be satisfied by moving electron pairs from non-central atoms to central atoms, creating double bonds in the process.Example - SO2

  7. O S O O S O Step 1 # of e1- is: 6 x 1 + 6 x 2 = 18 Step 2 & 3 Step 4 Step 5 Step 6

  8. Draw Lewis Structures for the following: SO2, CBr4, H2S, PBr5, SBr4, SeI2, SiS2, ClBr5, AlI3, SeS3,

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