Lewis structure of CO2

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The Lewis structure of CO₂ contains two double bonds, with carbon in the center, and two oxygens on either side. There are two lone pairs on each oxygen atom, and the carbon atom does not have any lone pair.

Steps

By using the following steps, you can easily draw the Lewis structure of CO₂:

#1 Draw skeleton
#2 Show chemical bond
#3 Mark lone pairs
#4 Complete octet on central atom
#5 Calculate formal charge and check stability

Let’s one by one discuss each step in detail.

#1 Draw skeleton

In this step, first calculate the total number of valence electrons. And then, decide the central atom.

• Let’s calculate the total number of valence electrons

We know that… carbon is a group 14 element and oxygen is a group 16 element. Hence, carbon has four valence electrons and oxygen has six valence electrons.

Now CO₂ has one carbon atom and two oxygen atoms.

So the total number of valence electrons = valence electrons of carbon atom + (valence electrons of oxygen atom × 2)

Therefore, the total number of valence electrons = 4 + 12 = 16

• Now decide the central atom

The atom with the least electronegative value is placed at the center. By looking at the periodic table, we get the electronegativity values for carbon and oxygen as follows:

Electronegativity value of carbon = 2.55
Electronegativity value of oxygen = 3.44

Obviously, carbon is less electronegative than oxygen. Hence, assume that carbon is the central atom.

So now, put carbon in the center and oxygens on either side. And draw the rough skeleton structure for the Lewis structure of CO₂ something like this:

Also read: How to draw Lewis structure of H₂O (4 steps)

#2 Show chemical bond

Place two electrons between the atoms to show a chemical bond. Since carbon is surrounded by two oxygens, use four electrons to show two chemical bonds as follows:

#3 Mark lone pairs

As calculated earlier, we have a total of 16 valence electrons. And in the above structure, we have already used four valence electrons. Hence, twelve valence electrons are remaining.

Two valence electrons represent one lone pair. So twelve valence electrons = six lone pairs.

Note that both (carbon and oxygen) are the period 2 elements, so they can not keep more than 8 electrons in their last shell.

Also, make sure that you start marking these lone pairs on outside atoms first. And then, on the central atom.

The outside atoms are oxygens, so each oxygen will get three lone pairs. And the central atom (carbon) will not get any lone pair, because all six lone pairs are used.

So the Lewis structure of CO₂ looks something like this:

In the above structure, you can see that the octet is completed on outside atoms. But, the central atom (carbon) doesn’t form an octet.

So in the next step, we have to complete the octet on the central atom.

Also read: How to draw Lewis structure of NO₂ (5 steps)

#4 Complete octet on central atom

Remember that carbon is a period 2 element, so it can not keep more than 8 electrons in its last shell.

Now carbon already has four valence electrons. Hence, carbon needs four more valence electrons to complete its octet.

So convert one lone pair from each oxygen atom to make a new bond with the carbon atom. And then, the Lewis structure of CO₂ looks something like this:

In the above structure, you can see that the octet is completed on the central atom (carbon), and also on the outside atoms. Therefore, the octet rule is satisfied.

After completing the octet, one last thing we need to do is, calculate the formal charge and check the stability of the above structure.

Also read: How to draw Lewis structure of NH₃ (4 steps)

#5 Calculate formal charge and check stability

The following formula is used to calculate the formal charges on atoms:

Formal charge = valence electrons – nonbonding electrons – ½ bonding electrons

Collect the data from the above structure and then, write it down below as follows:

• For carbon atom

Valence electrons = 4
Nonbonding electrons = 0
Bonding electrons = 8

Formal charge = 4 – 0 – ½ (8) = 0

• For each oxygen atom

Valence electrons = 6
Nonbonding electrons = 4
Bonding electrons = 4

Formal charge = 6 – 4 – ½ (4) = 0

Mention the formal charges of atoms on the structure. So the Lewis structure of CO₂ looks something like this:

In the above structure, you can see that the formal charges of both (carbon and oxygen) are zero. Therefore, this is the stable Lewis structure of CO₂.

And each horizontal line drawn in the above structure represents a pair of bonding valence electrons.

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Related

• Lewis structure of H₂O
• Lewis structure of NO₂
• Lewis structure of NH₃
• Lewis structure of HCN
• Lewis structure of SO₂

External video

• CO2 Lewis Structure – How to Draw the Dot Structure for Carbon Dioxide – Wayne Breslyn

External links

• CO2 Lewis Structure – Learn With Dr. Scott
• CO2 Lewis Structure and Molecular Geometry – What’s Insight
• CO2 (Carbon dioxide) Lewis Structure and Shape – Chemistry School
• CO2 Lewis Structure (Carbon Dioxide) – Pinterest
• CO2 Lewis Structure, Molecular Geometry and Hybridization – Geometry of Molecules
• What is the lewis structure for co2? – Socratic
• Draw the Lewis structure for CO2 and state its molecular geometry. Is it polar or nonpolar? – Homework.Study.com
• CO2 lewis structure, molecular geometry, bond angle, shape – Topblogtenz
• CO2 Lewis Structure, Molecular Geometry, Molar Mass & Hybridization – Science Coverage
• Molecular Geometry of Carbon Dioxide (CO2) – Chemistry Learner
• Lewis Dot of Carbon Dioxide CO2 – Kent’s Chemistry
• The Lewis Dot Structure for CO2 – MakeTheBrainHappy
• Chemical Bonding: CO2 Lewis Structure – The Geoexchange
• Carbon Dioxide – University of Illinois Urbana-Champaign
• Covalent bond and Lewis dot structure (H2O & CO2) (video) – Khan Academy
• CO2 Lewis Structure, Hybridization, Molecular Geometry, and MO Diagram – Techiescientist
• How to draw the CO2 Lewis structure – Quora
• CO2 Lewis Structure in 6 Steps (With Images) – Pediabay
• CO2 Lewis Structure, Geometry – Kemicalinfo
• What is the Lewis structure for carbon dioxide? – CK-12 Foundation
• How to draw CO2 Lewis Structure? – Science Education and Tutorials
• Lewis dot structures of CO2 – Chemistry Stack Exchange
• draw the lewis structure of co2 – Brainly
• Draw the Lewis structure for the carbon dioxide (CO2) molecule – Numerade
• what is the lewis structure for co2? – Chegg