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

You are watching: What is the bond order of hbr

It is used to prepare a selection of organic and inorganic bromine compounds. Not only that, it has its importance as a catalyst and also scientists room looking front to using it to make batteries.

HBr come in the kind of one acrid colorless gas and is soluble in alcohols and organic solvents.

It has actually a melting suggest of -124.40 F and also a density of 3.64 kg/metre^3.

Lewis Structure

Lewis Structure offers us the diagrammatic sketch of a molecule v details around its chemical bonding nature and electron pair formation.

If we are interested in having actually an idea about the internal structure and also nature the a provided molecule, we must learn about the sigma pi bond formation and also also about lone pairs.

Also well-known as electron period structure, we usage Lewis icons so that us can find out the electronic configuration of the within atoms that a molecule or ions.

Using dots, single and double lines according to the nature of bonds, the Lewis framework is the an initial step towards finding out about the properties of a chemical compound, be it hybridization or polarity.

Step 1

To uncover out the Lewis structure of any kind of given molecule, the very first step is to find out the total valence electron number.

Electron loss signifies the boost of positive charge thus we use the sign ‘+’. The gain of electrons rises the variety of negatively fee electrons as such we use the ‘-’ sign.

Step 2

For occurring the molecular structure, only knowing the number of valence electron is no enough. We additionally need to determine the main atom.

How have the right to we execute this?

Simple. Just examine the valency. Usually, the atom which is the the very least electronegative has the greatest valence and also has the highest number of bonding sites.

This is taken into consideration to be the main atom. Let us continue further.

Step 3

Now, let us map out the skeleton diagram of the molecule. By act this, we can understand the position of the solitary bonds much more appropriately.

Step 4

Now that us have drawn the molecular skeleton, we need to emphasis on the next step, i.e. The octet fulfillment.Have girlfriend heard about the “octet rule”?

The octet ascendancy is basically pertained to with the noble gas electronic configuration. It says the tendency of one atom within a molecule to have actually eight electron in the outermost or valence shell.

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

Step 5

The penultimate step in this procedure is based on finding out the necessity of many bonding. After ~ we are done with octet fulfillment, we have actually to inspect whether we need to construct any twin or triple bonds.

Step 6

The skeleton diagram has actually been sketched, single, dual bonds have actually been drawn and the octet dominance has been verified. As we pertained to the final step, currently we space left through the formal charge concept.


The over diagram offers us the formula to calculate the formal charge.

Thus, we need to examine whether the atoms inside the offered molecule have the least value the the officially charge.

Once done, ours Lewis structure is complete.

Let us currently calculate this for HBr.

HBr Lewis Structure

HBr or Hydrogen Bromide molecule is composed of one hydrogen atom and one bromine atom.

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

Bromine through an atomic variety of 35 belonging to group 7 like Chlorine and Fluorine and also therefore has actually seven electrons in that is outermost shell.

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

Since over there are just two atoms in Hydrogen Bromide, we execute not need to be concerned around the central atom concept.

According to step 3 that Lewis structure formation, we now have actually to draw the skeleton diagram of HBr.

Let us place the lone electron about the Hydrogen atom and also the 7 electrons about the Br atom. If we look in ~ the sketch, we will see that it has completed octet fulfillment.

Keep in mind, hydrogen needs just two atom to finish its octet configuration together it follows helium noble gas. Bromine obtained eight electrons about itself and hence, octet formation has been done and so is the solitary bond.


There is no require for lot of bond formation here. We will examine the formal charge according to action 6.

Now, HBr has actually one solitary bond and six electron or 3 lone pairs around Bromine. Our Lewis framework of Hydrogen Bromide is done.

Let united state go come the next principle of bonding

HBr Hybridization

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

Hybridization is an additional extremely vital topic of problem when it pertains to the chemical bonding nature that a molecule.

While Lewis Structure offers us the image of exactly how a molecule can look in 2D format, hybridization provides us the idea around why details atoms tend to incorporate in a certain fashion within a molecule.

So, if we desire to discover in detail around HBr, only discovering the Lewis structure is not enough, we likewise need come learn around Hybridization.

Hybridization encounters the overlap of atomic orbitals within a molecule to kind hybrid orbitals. Because that HBr, we must look in ~ the digital configuration that both Hydrogen and also Bromine.

For Hydrogen, that is 1s1.

For Bromine, the is 4s23d104p5.

So, the digital structure within HBr looks choose this:

H 1s14p14p14p14p14p13d104s2 Br

Therefore, the Bromine atom has actually three electron lone pairs around itself and one bond with hydrogen.

This leader to 4 electron pairs and also thus Br in hydrogen bromide is tetrahedral v a dihedral edge of 1090 to offer sp3 hybridization.

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

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

HBr Polarity

Polarity is an interesting concept when it involves chemical compounds and molecules. Do you know that difference in electronegativity deserve to lead come polarity?

This is basically concentrated on the distribution of charges inside a molecule: once there is a distinction in the confident and negative charges we check out the increase of dipole moment, which has a net worth that provides a molecular compound polar.

When it involves HBr, permit us discover out whether it is polar or non-polar.

Are you mindful of the fact that the Bromine atom has a greater electronegativity than Hydrogen?

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

This leader to fairly an electronegativity difference which provides HBr a polar molecule. For more detail, you should also read out the polarity that HBr.

This happens since the bromine has actually a an adverse charge on it and also Hydrogen has a positive charge top top it as result of the lone pair pulling in the direction of bromine within HBr.


HBr molecule Geometry


What is molecular geometry and also how have the right to we recognize it?

Molecular geometry is concerned with finding the end the shape of a molecule via part theories.

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

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

Molecular orbital Diagram


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

It is among the many descriptive and also diagrammatic representations of bonding whereby we resolve orbitals and also energy levels within a molecule.

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

Since Bromine is much more electronegative than Hydrogen, the ns is at a lower energy level than 1s that hydrogen.The overlap outcomes 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.

See more: 43.16 Rounded To The Nearest Whole Number, Envision Topic 2 Review

HBr is an amazing chemical link with advantageous properties and it is crucial that us learn about its interior structure for a much better understanding that the molecule as a whole.