Learn how to create and make Lewis Diagrams the simple way!

1. Lewis Diagrams
By: Alex and Etta
A3

2. Table of Contents
 What are Lewis Diagrams?
 Try Some Problems
 Importance of Lewis Diagrams
 For more help

3. What are Lewis Diagrams?
 A Lewis diagram is a representation of a molecule where dots are used to
show the valance electron* position around the atoms and lines or dot pairs
represent covalent bonds between atoms. Our goal is to get to 8 VE
surrounding the element because 8VE is stable. Hydrogen is different, it only
needs 2VE to be stable.
 *Valance Electrons?
Valence electrons (VE) are the electrons in the outer shell of an atom. The
valence electrons are the ones involved in forming bonds to adjacent atoms.
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4. How to draw them?
Solve for H2O, Water.
 Step 1. Determine the total numbers of valance electrons. Look at the
periodic table for help. H has 1 valance electron, and C has 6 valance
electrons.

5.  Step 2.
 Write the skeleton structure of the molecule and subtract the VE’s you use.

6.  Step 3.
 Distribute the remaining valance electrons to the elements as non-bonding
electrons so that each have 8 valance electrons, excluding Hydrogen (Hydrogen can
only have 2).

7. Try Some Problems
Try to solve these problems your self:
 1. CH4
 2. NH3
 3. CO2
 4. CH4
Click to see Answers
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8. Answers
This is what your answers should look like:
1. 2. 3. 4.
2.
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9. Importance of Lewis Diagrams
Resonance Structures
These resonance structures demonstrate the importance of Lewis Diagrams.
They show the differences in the bonds of molecules with the same atoms.
NO3
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10. For More Help
Links that may help:
Wikipedia
Chemed
Lewisdots
Schodor
Sources:
Video:
https://www.youtube.com/watch?v=MWDL5WCZBzE
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11. Questions?
Hydrocarbon H18C8