MO Diagram, O3 Lewis Structure, Molecular Geometry, and Hybridization

Everyone has heard of the loss of the ozone layer, right? The stratospheric ozone layer has a hole as a result of widespread global warming and the rapid rise in global temperature.

This results in significant climate change and environmental destruction. This molecular molecule, a pale blue gas with a molar mass of 47.99 g/ml, is commonly known as the activated oxygen.

It is excellent for inhibiting bacterial development and emits a harsh odour.

This molecule containing three oxygen atoms, which is derived from the molecule of dioxide, is extremely important from a chemical standpoint. If you wish to enter his molecule, please secure your seatbelts.

Because I’m going to take you on a tour of all the fundamental principles and explanations pertaining to ozone bonding.

Lewis Framework

To be precise, Lewis Structure refers to the representation of a molecule’s structure. It is the diagrammatic representation for comprehending the specifics of chemical bonding.

Lewis Structure is a fundamental idea in molecular chemistry, and the following steps outline how to effectively draw it:

Step 1

The first step in creating this structure is determining the total amount of valence electrons.

“+” represents positive charge, or the loss of electrons.

The symbol ‘-‘ represents the gain of electrons, or negative charge.

When computing valence electrons, these two signs must be considered.

Step 2

We must now identify the centre atom. How can we do so? Using a straightforward method, we can easily find the answer!

First, identify the atom with the lowest electronegative charge. This can be determined by computing the valence number. Typically, the element with the highest valence has the lowest electronegativity.

This atom will have a greater number of bonding sites than the others.

Step 3

The objective of this phase is to visualise the location of single bonds in the molecule relative to the centre atom.

This is accomplished by sketching the skeleton diagram of the respective molecules in accordance with the specifications.

Step 4

When an atom’s outermost electron shell has less than eight electrons, are they still in their reactive state?

Consequently, they respond appropriately and tend to produce more stable molecular compounds. Therefore, the octet rule is predicated on the idea that each atom’s valence shell should have eight electrons.

This is the fourth phase in the development of the Lewis Structure. Beginning with the electropositive atoms, gradually complete the octet of atoms.

Step 5

Once octet completion has been completed, we must determine if bond formation remains. Consequently, multiple bond formation is possible.

Now that all types of bond formation have been completed, the next step focuses on the formal charge idea.

Step 6

The development of single and multiple bonds leads to the sixth and last step of the procedure. In this section, we shall calculate the formal fee.

We must determine whether all atoms within the specified molecule are at their least formal charge.

The formula for formal charge is as follows:

O3 Lewis Structure

Here, we shall discuss ozone, whose chemical formula is O3.

The following discussion will therefore focus on determining the Lewis Structure of O3.

Ozone is composed of three atoms of oxygen. Oxygen is a member of group VI of the periodic table and has the atomic number 8.

Therefore, it possesses six valence electrons.

Thus, the total number of valence electrons in ozone is equal to three times six.

= 18

Similar to triiodide ion, where all of the atoms are iodine, all of the atoms in this compound are oxygen. Therefore, we will designate one of the three as the central atom and place the other two on the sides.

Based on step No. 3, we will now draw the skeletal structure of ozone. Place the 18 valence shell electrons (total count) to complete the octet while sketching.

According to our knowledge of the periodic table, we can position six electrons around each oxygen, as mentioned previously.

Observe the above diagram right now.

The oxygen atoms on the sides of the molecule have both reached octet. Each particle has eight electrons encircling it. However, the core atom has only six electrons surrounding it.

Therefore, to satisfy the octet rule, we must:

We must move two electrons from one of the lateral oxygen atoms to the oxygen atom in the centre.

The formation of the octet is now successful.

Regarding the central O atom, we now have a double bond and a single bond.

Since we might have drawn in any direction, there are now resonance structures. O3’s definitive Lewis Structure or electron dot structure has been completed after confirming the formal charge.

Combination of O3

What is the definition of hybridization? Why is this such a common topic in chemical bonding, and why is it important to study?

Hybridization is one of the most extensive and significant areas in molecular chemistry.

It is the process of combining orbitals to create hybrid orbitals. How and why many atoms tend to join is the foundation for hybridization.

Therefore, the study is essential for gaining a deeper understanding of a molecule and its features.

Therefore, to study about ozone, we must be familiar with its hybridization.

Now, how can we discover this?

How many electrons does the oxygen atom in the centre have? 8.

2s orbital has two electrons, while 2px and 2y contain the remaining six.

Total orbital number = 1s and 2p

The hybridization of the O3 molecule is therefore sp2.

The Molecular Structure of O3

To determine the ozone’s molecular geometry, we must examine the VSEPR theoretical model.

How do we approach this?

In the beginning, you must examine the terminal atoms.

Terminal atom no.= 2

Determine the number of lone electrons or lone pairs

2 independent electrons in the centre atom

Lone pair=1

Following this, we must match this to the VSEPR model graph.

Due to resonance, the ozone molecule is discovered to have a curved trigonal planar form. Repulsion results in a bond angle of approximately 116 degrees.


Polarity is based on the distribution of positive and negative charges surrounding the constituent atoms of a molecule.

The dipole moment is utilised to quantify or measure polarity. This has a net value only when a charge difference exists.

In the case of ozone, the standard dipole moment value fluctuates, and partial + and + charges are present within the molecule.

The central ozone atom will carry the partial+ + charge.

Dipole moments are thus responsible for the downward motion of the ozone molecule. Due to the net dipole created by the lone electron pair, the ozone molecule is believed to be polar in nature.

O3 Molecular Orbital Diagram (MO)

The molecular orbital hypothesis is one of the most groundbreaking chemical bonding notions.

It employs quantum physics to provide a representation of the bonding nature within a molecule that is nearly explicative in detail.

Here is a graphical illustration of the ozone MO diagram.

Ozone is a trigonal planar molecule. Consequently, as we remove one p orbital from each oxygen(O3) atom, we concentrate on the 4-electron anion H3-.

According to the hybrid orbital approximation, the 2s, 2py, and 2pz orbitals will be considered. Then, semi-empirical Molecular Orbital computations will be performed, incorporating the concept of group orbitals.


Indeed, chemical bonding is one of the most extensive and crucial aspects of life. If you like to discover minute details about any molecule, you have arrived to the correct location.

I hope you have a fundamental understanding of the ozone molecule now that we have gone through its primary principles in depth.

We’ve talked about Lewis structure and hybridization. The form and polarity of the molecule, as well as the MO Diagram, have been described. So, did you enjoy yourself?

I believe so. Always continue to learn.

Read more: Is H3PO4 a base or an acid?

Misha Khatri
Misha Khatri is an emeritus professor in the University of Notre Dame's Department of Chemistry and Biochemistry. He graduated from Northern Illinois University with a BSc in Chemistry and Mathematics and a PhD in Physical Analytical Chemistry from the University of Utah.


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