Drawing Lewis Structures - PowerPoint

							Drawing Lewis Structures
           Drawing Molecules
• Lewis Dot Structures show the valence
  electrons in each atom
  – These structures will show how each atom in a
    molecule shares electrons
           Drawing Molecules
• Draw the Lewis Structure for:
  H
  C
  P
  O
  F
  Cl
             Drawing Molecules
• Always include unshared pairs of electrons
• A long dash (-) signifies a single pair of shared
  electrons
   – This is a single bond
• Be sure to check for full octets (full valence shell)
• A double long dash (=) signifies a double bond
• A triple long dash (=) signifies a triple bond
          Drawing Molecules
• Draw the following molecules
  HCl
  F2
  H2O
  CH4
  NCl3
  O2
           Drawing Molecules
• Resonance structures show molecules that
  cannot be represented by a single Lewis
  structure
  – Some examples are ozone (O3) and nitrogen
    dioxide (NO2)
           Drawing Molecules
• When drawing the Lewis structure for
  polyatomic ions, do not forget to count the
  electrons!
  – What does it mean to have a negative charge, or
    positive charge?
  HS-
  NF4+
  C2O42-