Slides pertaining to the progression in thinking for developing Lewis Structures, Ohio Learning Standard C.PM.4: Representing Compounds.

1. Representing Compounds:
The Progression in Lewis
Structures
General Chemistry

2. Determine the desired amount of valence electrons (based
on the periodic table) for an element to depict a Lewis
structure for one of its atoms.

3. Properly representing a compound and possibly
determining the polarity and what type of compound the
molecule represents (ionic, polar covalent, or non-polar
covalent).
Does every atom need to have lone pairs on its’ sides? Why not?

4. Determining the valence of every atom in a Lewis
Structure.
To determine the number of valence electrons in a lewis structure, the
bonds between two atoms count as one each. The lone pairs of electrons
on an atom count toward two valence electrons for the atom. The sum of
these two components make up the valence of an atom.
The red numbers
account for each
hydrogen valence,
while the blue sums
up the valence of
carbon.

5. Sometimes different atoms may allow for multiple bonds.
Many non polar covalent
molecules are monatomic
(one element) compounds.

6. Charge and Polyatomic Ions
Charge is also tracked by accounting for the valence electrons on an atom. If the number of valence electrons is more
than the desired than we have more negative charge than what is in the nucleus of the atom. This example would
represent an anion (negative charged ion).

7. Expanded Octet
Elements in the third period of the periodic table can have more than 8 electrons in the outermost energy level,
ignoring the octet rule.

8. Molecular and Electron Geometry.
Based on the number of bonds and lone pairs, the molecular and electron
geometry can be determined.

9. Bond Angles
Another part of the molecular geometry is visualising the bond angles, which is easily done with a physical stick and
ball model. This also may aid in understanding why certain reactions take place in more advanced courses.

10. Image Sources
https://pixabay.com/illustrations/periodic-table-element-chemistry-5581166/
Microsoft Paint