Tutorial 7 Drawing Lewis Structures

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Transcript Tutorial 7 Drawing Lewis Structures

Drawing Lewis Structures
• Step 1: Identify central atom (lowest electron affinity,
usually C,N,P,S)
• Step 2: Calculate total number of valence electrons
(write out electronic configurations)
• Step 3: Draw single bonds between central atom and
peripheral atoms, 2e- each
• Step 4: Assign electrons to peripheral atoms so they
have a full octet (except H)
• Step 5: Assign remaining electrons to central atom
• Step 6: If central atom is short of a full octet move a
lone pair from a peripheral atom to form a double
bond.