Hydrogen bromide, HBr is a hydrogen halide link owing come the reality that bromine belongs come the halogen family. Quite a corrosive and dangerous chemical, it can be advantageous too in a many ways.

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It is offered to prepare a variety of organic and also inorganic bromine compounds. Not just that, it has its prominence as a catalyst and also scientists space looking front to using it to make batteries.

HBr comes in the kind of one acrid colorless gas and also is dissolve in alcohols and organic solvents.

It has a melting allude of -124.40 F and a thickness of 3.64 kg/metre^3.

Lewis Structure

Lewis Structure offers us the diagrammatic map out of a molecule with details about its chemistry bonding nature and also electron pair formation.

If we are interested in having actually an idea around the inner structure and nature of a given molecule, we must learn around the sigma pi link formation and also around lone pairs.

Also recognized as electron dot structure, we use Lewis symbols so that we can find out the digital configuration that the inside atoms the a molecule or ions.

Using dots, single and dual lines follow to the nature the bonds, the Lewis framework is the very first step towards finding out about the properties of a chemical compound, it is in it hybridization or polarity.

Step 1

To uncover out the Lewis structure of any given molecule, the an initial step is to find out the complete valence electron number.

Electron lose signifies the rise of positive charge for this reason we use the sign ‘+’. The gain of electrons rises the number of negatively charged electrons because of this we usage the ‘-’ sign.

Step 2

For arising the molecule structure, only knowing the number of valence electrons is no enough. We additionally need to recognize the main atom.

How can we carry out this?

Simple. Just check the valency. Usually, the atom i m sorry is the the very least electronegative has actually the highest possible valence and has the highest variety of bonding sites.

This is thought about to it is in the central atom. Allow us continue further.

Step 3

Now, allow us map out the skeleton diagram of the molecule. By act this, we deserve to understand the place of the solitary bonds much more appropriately.

Step 4

Now that us have drawn the molecule skeleton, we need to focus on the following step, i.e. The octet fulfillment.Have friend heard about the “octet rule”?

The octet dominion is basically involved with the noble gas electronic configuration. It claims the propensity of one atom inside a molecule to have actually eight electron in the outermost or valence shell.

While we are finding out the Lewis Structure, we also need to focus on the octet fulfillment- starting with the electropositive atoms, allow us proceed towards octet completion.

Step 5

The penultimate step in this procedure is based on finding the end the need of lot of bonding. After ~ we space done v octet fulfillment, we have to inspect whether we require to construct any double or triple bonds.

Step 6

The skeleton diagram has actually been sketched, single, twin bonds have been drawn and the octet preeminence has to be verified. As we come to the last step, currently we space left with the formal charge concept.


The above diagram gives us the formula to calculation the official charge.

Thus, we need to examine whether the atoms within the given molecule have actually the least value that the officially charge.

Once done, our Lewis framework is complete.

Let us currently calculate this because that HBr.

HBr Lewis Structure

HBr or Hydrogen Bromide molecule consists of one hydrogen atom and also one bromine atom.

Hydrogen has actually only one electronic shell through one electron and needs just two electron to achieve octet fulfillment. ( it complies with the helium configuration).

Bromine through an atomic number of 35 belong to team 7 favor Chlorine and also Fluorine and also therefore has seven electron in that outermost shell.

The total variety of valence electrons in HBr = 1+7 = 8

Since over there are only two atoms in Hydrogen Bromide, we perform not need to be concerned around the main atom concept.

According to step 3 the Lewis structure formation, us now have actually to attract the skeleton diagram of HBr.

Let us place the lone electron around the Hydrogen atom and the 7 electrons roughly the Br atom. If us look at the sketch, we will watch that the has accomplished octet fulfillment.

Keep in mind, hydrogen needs simply two atom to complete its octet configuration as it complies with helium noble gas. Bromine obtained eight electrons roughly itself and hence, octet formation has been done and also so is the solitary bond.


There is no require for many bond formation here. We will inspect the formal charge according to action 6.

Now, HBr has actually one solitary bond and six electrons or 3 lone pairs around Bromine. Ours Lewis structure of Hydrogen Bromide is done.

Let us go come the next ide of bonding

HBr Hybridization

The HBr (Hydrogen Bromide) molecule has actually sp3 hybridization.

Hybridization is one more extremely an important topic of worry when it comes to the chemical bonding nature the a molecule.

While Lewis Structure provides us the image of just how a molecule can look in 2D format, hybridization offers us the idea around why particular atoms often tend to combine in a specific fashion within a molecule.

So, if we want to learn in detail about HBr, only knowing the Lewis framework is not enough, we also need to learn about Hybridization.

Hybridization deals with the overlap of atomic orbitals inside a molecule to kind hybrid orbitals. Because that HBr, we should look at the digital configuration of both Hydrogen and also Bromine.

For Hydrogen, the is 1s1.

For Bromine, that is 4s23d104p5.

So, the electronic structure inside HBr looks choose this:

H 1s14p14p14p14p14p13d104s2 Br

Therefore, the Bromine atom has three electron lone pairs roughly itself and one bond through hydrogen.

This leads to four electron pairs and also thus Br in hydrogen bromide is tetrahedral through a dihedral edge of 1090 to provide sp3 hybridization.

Here the s orbital of hydrogen combines v the 4p orbit of bromine.

Due to a higher level of efficient (stronger) nuclear fee for valence covering electrons in ~ Bromine rather than at Hydrogen, the sp3 hybrid orbitals allude away more from the H-Br sigma bond.

HBr Polarity

Polarity is one interesting concept when it concerns chemical compounds and molecules. Do you know that difference in electronegativity can lead come polarity?

This is basically focused on the distribution of charges within a molecule: once there is a distinction in the hopeful and an adverse charges we watch the increase of dipole moment, which has a net value that provides a molecular link polar.

When it involves HBr, let us find out even if it is it is polar or non-polar.

Are you conscious of the truth that the Bromine atom has a higher electronegativity than Hydrogen?

Br has actually an electronegativity value of 2.96 conversely, hydrogen has only 2.2.

This leader to rather an electronegativity difference which makes HBr a polar molecule. For much more detail, girlfriend should also read the end the polarity of HBr.

This happens because the bromine has a an unfavorable charge top top it and also Hydrogen has a positive charge on it because of the lone pair pulling towards bromine inside HBr.


HBr molecule Geometry


What is molecule geometry and how deserve to we determine it?

Molecular geometry is involved with finding out the form of a molecule via some theories.

The most common is the VSEPR model i.e. Valence covering Electron Pair Repulsion design Theory which determines exactly how a molecule is going come be shame according to the electron position and bond formation.

HBr has actually a linear molecular shape and also has a bond angle of 180 degrees.

Molecular orbit Diagram


HBr is a heterogeneous diatomic molecule. The molecular orbital concept is based on the chemistry bonding ide of molecules.

It is just one of the many descriptive and diagrammatic representations of bonding whereby we deal with orbitals and energy levels inside a molecule.

Interaction happens between s and p orbitals: s that Hydrogen and p that Bromine.

Since Bromine is more electronegative 보다 Hydrogen, the ns is in ~ a lower energy level 보다 1s that hydrogen.The overlap results in sigma bonding and sigma-antibonding orbitals.


In this article, us read around the Lewis Structure, Hybridization, Polarity, molecule Geometry, and also MO diagram of Hydrogen Bromide molecule.

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HBr is an exciting chemical link with helpful properties and it is necessary that us learn about its internal structure for a better understanding that the molecule as a whole.