CO2 Molecular Geometry and Lewis Structure

Molecular Geometry which is also known as Molecular Structure is the three-dimensional construction or organization of particles in a molecule. If you are willing to understand the molecular structure of a compound, you can decide its polarity, reactivity, hybridization, shade, magnetism, and genetic movement.

CO2 Molecular Geometry and Lewis Structure

In this article, you will get some simplest explanations regarding the molecular geometry of CO2, CO2 Lewis structure, and its hybridization. So, silence your cell phone for next 15 minutes, take your pen and paper and start studying… I mean, reading! I am sure you can learn fast just in few minutes.

Understand Lewis structure

If you are new in the field of molecular geometry and Lewis structure, firstly you should understand the meaning of Lewis structure for the better understanding of the molecule’s shape.

Lewis structure is nothing but the electron structure made by the dots. This structure does not give the guarantee to tell the exact shape of molecules, but helps a lot to assume what it could be! It helps in the identification of the bond pairs and the lone ones.

After that, the application of VSEPR theory takes place with the Lewis structure. VSEPR theory means Valence Shell Electron Pair Repulsion theory. It decides molecular geometry and the electron group geometry.

CO2 Lewis structure

In the formation of CO2, there are two particles; Carbon, and Oxygen. Carbon is in group 4 and oxygen is in group 6. Moreover, there is 2 Oxygen. So CO2 = 4 + 6(2) = 16. So, total valence electrons are 16.

Carbon is the least electronegative that means it stays at the center. So, put the Carbon in the middle and then set the oxygen either side of that!

formation of CO2


Here you can see some chemical bonds. Now, let’s put a pair of electrons between each of this oxygen. It will look like this:

co2 chemical bonds


We have used 4. After that, complete the octets on the outer shell.

co2 outer shell


Now, let’s check and see if we have octets. The oxygen on your right has 8. The oxygen on your left has 8. So, they both have octets. And the carbon only has 4 valence electrons; it doesn’t have octets.

Okay, it’s time to share these nonbonding electrons between both the atoms! It will look like this. Start from considering Oxygen atom.

co2 Oxygen atom


As you can see, Oxygen has 8 electrons. So, that is perfect. And the carbon has 6; which is a little bit closer. Now, repeat the same process to the other Oxygen electron. Let’s take some electrons and share them on the other side so that Oxygen can have 8 and carbon can have 6.

co2 Oxygen electron


Finally, we have completed the octet. We have used 16 valence electrons in total. (Just like the beginning!) You can also write it as a structural formula, and that would look like this:


co2 structural formula

In this structural formula, such two lines are the same as these two pairs of valence electrons.


co2 valence electrons

I hope you are clear with the Lewis structure. Now, let’s discuss the hybridization of Carbon Dioxide.

CO2 Hybridization

Let’s take a look at the hybridization for each atom in the CO2 molecule carbon dioxide.  We are going to look at each of the regions around the particles to figure out the hybridization of the CO2 molecules.

Each of the atoms in CO2 will count unbonded electron pairs and then Sigma bonds. Starts with the Carbon atom, we have two double bonds on the carbon atom that means we have a SIGMA bond on each side and a PI bond above it.


CO2 Hybridization

Note: Red mark stands for PI bond and Brown mark stands for SIGMA bond.

We don’t have any unbonded electron pairs on the central Carbon, so it’s just those two sigma bonds. Since we have 2 regions; that means we have S and a P orbital hybridize. So the hybridization on that carbon is “SP.”

Since the oxygen atoms are symmetrical in sio2, all we need to do is look at only one of them. So, when we look at the oxygen atom here on the right, there is a SIGMA bond and two unbonded electron pairs.

So, now we have three regions attached to that oxygen. That makes its hybridization – SP2. And the other oxygen will be the same. So, that’s the hybridization for CO2.


CO2 Hybridization sp2

So, are we clear with the molecular geometry of CO2? If yes, kindly read other articles to understand various molecular geometry and Lewis structure of different combinations. Keep loving chemistry; It’s fun! Enjoy.

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