1. How to draw the Lewis structure
of carbon monoxide, CO
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2. Steps to draw the Lewis structure
1. Find the number of valence electrons for
each of the atoms in the molecule.
The number of valence electrons is usually the
same as the group number where the element
is located.
3. The number of valence electrons for carbon is 4 (group 4)
4. The number of valence electrons for oxygen is 6 (group 6)
5. 2. Count the total number of valence electrons
in the molecule:
Sum the valence electrons from each atom in
the molecule
6. For CO
• Total valence e. from C: 4
4 e. x 1 C = 4
• Total valence e. from O: 6
6 e. x 1O = 6
Total valence e. in the molecule: 4 + 6 = 10
7. 3. Use the octet rule to figure how many octet
electrons the atoms should have:
Most atoms need 8 electrons to complete their
valence shield
Hydrogen is an exception and needs only 2
8. For CO
• Carbon should have 8 valence electrons
• Oxygen should have 8 valence electrons
9. 4. Draw an initial sketch of the molecule by
placing the symbol of each atom in a diagram
For carbon monoxide, CO
O C
10. 5. Place the valence electrons of each
atom around them, starting from the
outer atoms
25. Now we just need to change the dots for lines to
represent a triple bond:
26. Practice writing the Lewis structure of any other
molecule!
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